2015 Ford Fusion complaints

The contact owns a 2015 Ford Fusion. The contact stated that while driving at an undisclosed speed, the vehicle stalled and then lost motive power. The vehicle failed to restart. The check engine warning light and two other unknown warning lights were illuminated. The vehicle was towed to an independent mechanic, where the battery was replaced and the vehicle was able to restart; however, the failure reoccurred. The vehicle was then diagnosed that the brake booster vacuum pump and front brake hose needed to be replaced. The vehicle was repaired. The contact received notification of NHTSA Campaign Number: 23V162000 (Service Brakes, Hydraulic). The manufacturer was not made aware of the failure. The approximate failure mileage was 9,000.

Rear brakes locked up, causing brake pad, caliper, and rotor failure. All components replaced for left and right side rear. Right rear brakes failed a second time including complete brake failure with brake pedal traveling to the floor, same parts replaced. Third failure on the rear brake with the brake pedal again traveling to the floor rendering the car unsafe. No warning lights at any time. Car was repaired twice by an independent service center. This put ourselves and others at risk to serious injury due to the inability of the vehicle to come to a safe stop.

The contact owns a 2015 Ford Fusion. The contact stated that after starting the vehicle, the steering wheel seized. The steering fault message was displayed. The vehicle was towed to an independent mechanic, who diagnosed that the steering gear motor had detached. The mechanic replaced the steering gear motor. The manufacturer was made aware of the failure and advised the contact to file a complaint with the NHTSA Hotline. The contact related the failure to NHTSA Campaign Number: 19V632000 (Steering) however, the VIN was not included in the recall. The failure mileage was approximately 115,000.

There is coolant slowly leaking into cylinders. I am having to put antifreeze in reservoir every other month. I am afraid it will ruin engine or catch on fire.

The contact owns a 2015 Ford Fusion. The contact received notification of NHTSA Campaign Number: 22V011000 (Service Brakes, Hydraulic) and 22V413000 (Power Train) however, the parts to do the recall repairs were unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the issue. The contact had not experienced a failure. Parts distribution disconnect.

The contact owns a 2015 Ford Fusion. The contact stated while driving 70 MPH, the vehicle lost power steering functionality. The contact stated that he was able to veer to the side of the road although the steering wheel was extremely difficult to turn. The contact turned off and restarted the vehicle; however, the failure persisted. The traction control and the hill park assist warning lights were illuminated. The contact was able to drive to his destination. The contact stated that upon inspecting the vehicle, he noticed that one of the steering gear motor bolts was missing and another one was fractured. The dealer was notified of the failure and informed the contact that the vehicle could not be repaired under NHTSA Campaign Number: 19V632000 (Steering) since the VIN was not included. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 150,000.

The engine codes stated that cylinder 3 was misfiring, and all of the spark plugs were replaced. The check engine light went off for a few days and then came on with the same code. Then all of the coil packs were replaced. A few days later the engine light "coolant overheating" came on and the engine started running rough, the computer stated that it was shutting the car down to half power. There were visible signs of coolant sprayed all over the engine. After allowing the car to cool off for 2 hours the car continued to run rough and display coolant overheating. The car was unable to reverse but could go forward. The car was taken to a mechanic and cooling issue codes came up. The cooling system was tested and the water pump was checked before the coolant was found to be leaking into cylinder 3. The car was not repaired, as this is the second engine for this car with approximately 130,000 miles.

The contact owns a 2015 Ford Fusion. The contact stated that the steering wheel became difficult to turn with the power steering assist warning light and electrical steering failure warning light being illuminated. The following day the steering wheel had completely seized. The contact found notification of NHTSA Campaign Number: 15V250000 (Steering) and believed that the failure was related to the recall. The dealer was contacted and confirmed that the VIN was not included in the recall. The dealer stated that the steering gear motor bolts needed to be replaced. The vehicle was in the process of being repaired. The manufacturer was made aware of the failure. The failure mileage was unknown.

The contact owns a 2015 Ford Fusion. The contact stated while driving 60 MPH, the steering wheel became firm with the power steering warning light illuminated. The vehicle was towed to a dealer and the dealer stated that the power steering gear needed to be replaced. The vehicle was not repaired. The manufacturer was contacted and advised the contact to file a complaint with the NHTSA Hotline. The failure mileage was 175,000. The contact stated that the vehicle was repaired. They believe that this failure is similar to other Ford vehicles that were covered under recall #19V63000 regarding the steering gear.

In July 2021 I had the CPV replaced because the purge valve was stuck open. Now, less than 2 years later, 45,000 miles later, I am once again having the same issue. Code P1450. Unable to bleed up fuel tank. Just like last time. My vehicle check engine light is on and after I get gas my car starts sputters and does not want to start.

My car has been losing power and randomly stalling for a while now. Today as I was driving it was happening more and then suddenly my brake pedal became hard as a rock, and the hill assist warning came up. It keeps stalling and will not remain running for longer than 2-3 minutes of being on. This almost caused me to ram several cars due to not being able to stop quickly enough. No lights came on other than check engine and it has not been inspected as this has only happened today. However the stalling of the car has been going on for about 3 months and I’ve been very pregnant and unable to have it looked at. The loss of power in the car happens and sometimes downshift’s extremely hard causing a loud jerk noise from the underside of the vehicle. Once turned off and turned back on it goes right back to normal until it decides to do it again. It can happen a couple of times or it can happen 100 times within a 5 mile period and I never know when it’s going to happen until it’s actually doing it. Extremely dangerous and I’ve seen several 2015 owners posting about issues of the 2015 brake system/bumper etc. I’ve seen recall talk but this site shows no recalls, please get this issue recalled asap!

The contact owns a 2015 Ford Fusion. The contact stated that after his daughter started the vehicle, the check engine warning light illuminated. The vehicle was taken to an independent mechanic, where it was diagnosed that the spark plugs, and other unknown components needed to be replaced. The vehicle was repaired; however, the failure reoccurred. The contact stated that while his daughter was driving at an undisclosed speed, the vehicle lost motive power. The vehicle was able to restart and was taken to another independent mechanic, where it was diagnosed that the head gasket needed to be replaced. The contact became aware of NHTSA Campaign Number: 17V209000 (Engine and Engine Cooling); however, the VIN was not included in the recall. The vehicle remained with the independent mechanic awaiting the repair. The manufacturer was made aware of the failure and advised the contact to file a complaint with the NHTSA Hotline. The approximate failure mileage was 72,000.

The contact's daughter owns a 2015 Ford Fusion. The contact stated that while her daughter was driving at an undisclosed speed, the vehicle stalled without warning. The vehicle was towed to the dealer where it was diagnosed that the transmission had failed and needed to be replaced. The vehicle was repaired; however, a year later while the contact’s daughter was driving at an undisclosed speed, a message indicating that the vehicle was overheating appeared on the instrument panel. The vehicle then inadvertently decelerated and stalled. The vehicle was towed to an independent mechanic where it was diagnosed that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure and the contact was advised to call the NHTSA Hotline. The failure mileage was approximately 140,000.

The contact owns a 2015 Ford Fusion. The contact stated that upon starting the vehicle inside her garage, there was an abnormal smoke odor detected inside the vehicle. The contact drove out of the garage and turned off the vehicle. The contact opened the hood and the smoke dissipated. The contact restarted the vehicle and noticed that the check engine warning light was illuminated. The contact checked the coolant. The vehicle was taken to an independent mechanic who informed her that the coolant level was low. The mechanic added coolant. There was no indication of a coolant leak. The contact stated that while driving, the vehicle was blowing cold air. The contact checked the coolant level and noticed that the coolant level was low after a week. The contact added coolant. The vehicle was taken to an independent mechanic again, who informed her that coolant was leaking into the cylinders and suggested an engine replacement. The contact called the local dealer who informed her that the vehicle was not covered under recall. The vehicle was not diagnosed or repaired. The manufacturer was contacted and referred her to the NHTSA Hotline. The failure mileage was approximately 130,000.

The contact owns a 2015 Ford Fusion. The contact stated while driving approximately 30 MPH, the vehicle stalled. The message that the engine was overheating, and that the coolant level was low was displayed. The vehicle was towed to the local dealer where it was diagnosed there was an internal coolant leak, and an engine replacement was needed. The vehicle was not repaired. The manufacturer was contacted and referred her to the NHTSA Hotline for assistance. The approximate failure mileage was 149,705.

Car indicated it was overheating and shutdown. Could not move vehicle. Had towed and it was discovered coolant had been leaking into the engine and it needs to be replaced.

The contact owns a 2015 Ford Fusion. The contact stated while reversing at his residence there was an abnormal sound coming from the steering wheel while turning. The contact stated there was no warning light illuminated. The contact was able to continue driving to his destination. The contact took the vehicle to an independent mechanic where it was diagnosed with needing the steering gear bolt and assembly to be replaced. The vehicle was not repaired. The contact called a local dealer and made them aware of the failure. The manufacturer had been informed of the failure and informed the contact that NHTSA Campaign Number: 19V632000 (Steering) repair was completed by the previous owner. The failure mileage was approximately 130,000.

The contact owns a 2015 Ford Fusion. The contact stated while driving approximately 25 MPH, the steering wheel seized, with the power steering assist fault and two other unknown messages displayed on the instrument panel. Upon investigation, the contact discovered NHTSA Campaign Number: 19V632000 (Steering) which she linked to the failure. Both the dealer and the manufacturer were notified of the failure, and both stated that the vehicle was not under recall. The vehicle had yet to be repaired. The failure mileage was approximately 127,000.

My sun visor came off when I went to put it down while I was driving which almost led to a car accident on the highway. The one in my passenger side is doing the same thing.

I was taking my granddaughter to school. I stopped to put my car into reverse to park and the gear shift was stuck. I couldn’t move it into any position but neutral. I pulled my emergency brake concerned that that the car would roll. I sat in my car for several hours because I didn’t know what was wrong or what to do. I finally decided to have it pulled home until I could find out what happened.

The contact owns a 2015 Ford Fusion. The contact stated while making a turn, the steering wheel became stiff without any warning. As a result, the contact crashed into a parked vehicle and the front fender was damaged. The contact shut down the vehicle and when the contact restarted the vehicle, the steering wheel was still stiff, the traction control warning light illuminated, and the steering loose stop safety warning message illuminated. The vehicle was not diagnosed. The manufacturer was not contacted. The failure mileage was 108,000.

The contact owns a 2015 Ford Fusion. The contact stated that while driving at an undisclosed speed, the vehicle lost motive power. The contact pulled over on the side of the roadway and restarted the vehicle. The vehicle failed to accelerate above 30 MPH, with the check engine warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed with coolant intrusion into cylinder #2, and the engine needed to be replaced. The vehicle was then taken to Fred Beans Ford (876 N Easton Rd, Doylestown, PA 18902) where it was diagnosed with coolant intrusion into the cylinders, and the engine needed to be replaced; however, the replacement part was on backorder. The dealer related the failure to Technical Service Bulletin: 19-2139 (1.5L Eco-boost - Low Coolant, White Exhaust Smoke and/or Illuminated Mil - Built On Or Before 10-Jun-2019) however, the vehicle was not covered under the TSB. The vehicle was not repaired. The manufacturer was made aware of the failure and informed the contact that the warranty had expired. The failure mileage was approximately 131,000.

The contact owns a 2015 Ford Fusion. The contact stated that the vehicle was overheating. The contact checked the coolant and notice that there was no coolant in the vehicle. The contact added more coolant, but the failure reoccurred. The vehicle was not diagnosed. The dealer was contacted and stated that the VIN was not included in a recall. The manufacturer was contacted and stated that the vehicle was not under recall The failure mileage was 117,000.

The contact owns a 2015 Ford Fusion. The contact stated while driving at approximately 7 MPH leaving a parking lot, the power steering failed to operate as needed. The power steering assist and several other unknown warning lights illuminated. The contact had the vehicle towed to a local dealer, where it was diagnosed and determined that the steering gear motor needed to be replaced. The vehicle had not been repaired. The manufacturer had been informed of the failure. The contact researched online and related the failure to NHTSA Campaign: 19V632000 (Steering). The failure mileage was approximately 48,000.

The contact owns a 2015 Ford Fusion. The contact stated the vehicle was consuming an excessive amount of coolant. In addition, while the contact refilled the coolant, he smelled and abnormal odor. The vehicle was taken to the dealer where it was diagnosed as engine coolant intrusion and the contact was informed that the engine needed to be replaced. The vehicle was not repaired. The contact referenced the failure to TSB: 22-2322 (Coolant Intrusion into the Cylinder). The manufacturer was made aware of the failure and referred the contact to file a complaint with NHTSA Hotline. The failure mileage was approximately 200,000.

Knocking sounds started happening when turning steering wheel. Confirmed by independent mechanic and Rodman Ford dealership to need power steering rack/electric motor. Recall for this problem on other 2015 Ford fusions but my VIN is not included. I have been told this is a serious safety issue and it should be covered.

The contact owns a 2015 Ford Fusion. The contact stated that upon acceleration, the steering wheel became difficult to maneuver. The power steering assist fault warning light was illuminated. The vehicle was taken to an independent mechanic where it was diagnosed that the steering rack needed to be replaced. The dealer was notified of the failure and the contact was informed that the vehicle was previously repaired under a recall. The contact referenced NHTSA Campaign Number: 19V6320000 (Steering). The manufacturer was notified of the failure and the contact was informed that the VIN was not included in the recall, but no further assistance was provided. The failure mileage was approximately 93,000.

The contact owns a 2015 Ford Fusion. The contact stated while driving 60 MPH, the vehicle was overheating. An alarm sounded and the message “HOT” was displayed. The contact stated that the vehicle cooled down as he released the accelerator pedal. The vehicle was taken to an independent mechanic where it was diagnosed that the bolts had backed out from the intake manifold causing coolant to leak into the engine, leading to spark plug failure. The vehicle was not repaired. The dealer was notified of the failure. The manufacturer was notified of the failure and referred the contact to the NHTSA hotline. The failure mileage was approximately 70,000.

Drove the car last on 1/18/2023, no issues with steering whatsoever; never saw a warning light on dash. Then on 1/19/2023, I had to go to work and attempted to make the trip. Upon turning the key the car started but the dash illuminated two warnings. [STEERING-ASSIST FAULT-SERVICE REQUIRED] [SERVICE ADVANCE TRAC] I had not experienced any issues prior to this. Now the cars steering is very difficult to steer. Apparently, some drivers have experienced this while driving, this could be very dangerous and investigated as this could be lethal in certain circumstances. There was a recall for bolts, to my best of knowledge this was fully completed by a local registered Ford dealership. This causes me worry and I think Ford should look into this or at the least perform a complimentary assessment of what is going on and offer some solutions to such an issue that apparently is not uncommon.

The contact owns a 2015 Ford Fusion. The contact stated while starting the vehicle, the PUSH to START button was pressed; however, the vehicle failed to start. The vehicle was towed to the dealer to be diagnosed and the contact was informed that the PUSH to START button needed to be replaced. The vehicle was repaired. The manufacturer was contacted and stated that the vehicle was out of warranty and offered no additional assistance. The approximate failure mileage was 78,000.

Coolant intrusion - excessive coolant consumption, white smoke emitting from tailpipe, spike in engine temperature, engine sputtering and not running correctly.

The contact owns a 2015 Ford Fusion. The contact stated while driving approximately 60 MPH, the vehicle began to lose motive power. The contact depressed the accelerator pedal and the vehicle lunged forward and then lost motive power again. The contact stated no warning light was illuminated. The contact stated that the vehicle went into LIMP Mode. The contact exited the highway and drove to a dealer at approximately 25 MPH. The contact stated that the dealer diagnosed the vehicle and determined that coolant had entered the engine block and that the engine needed to be replaced. The dealer informed the contact that the engine was not the original engine and was a replacement. The contact stated that he was the second owner of the vehicle. The vehicle was not repaired. The manufacturer had been informed of the failure. The failure mileage was 83,507.

The contact owns a 2015 Ford Fusion. The contact stated while operating the vehicle, the engine misfired, lost coolant, and overheated. The vehicle was taken to the dealer who diagnosed that the engine was faulty and needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure, but no assistance was offered. The contact also stated that the backup camera and tire pressure monitoring system were faulty. The failure mileage was 30,000.

When I went to stop at a stop sign, the brake pedal went all the way to the floor and the car went partially through the stop sign. I was able to pump the brakes and get relatively solid braking, so I drove the two blocks back to my home. Once home, I pumped the brakes approximately 10 times more and the low fluid light came on, indicating a brake leak. Since the brake reservoir was able to empty in approximately 12 pumps, the leak must be relatively severe. The car is approximately 8 years old, has about 125,000 miles on it, has always been serviced by the dealership. About 2 months ago the brakes were inspected and the rear brake pads and rotors were replaced. Thus, there is no reason for a severe brake leak such as this.

My Ford fusion has a coolant leak and ford said I need a repair. Price for repair is $9,584.89. It is a known problem with a TSB (see below) Summary This article supersedes TSB 19-2139 to update the production fix date. Issue: Some 2014-2019 Fusion vehicles built on or before 10-Jun-2019 and 2017-2019 Escape vehicles built on or before 08-Apr-2019 equipped with a 1.5L EcoBoost engine may exhibit low coolant level, white exhaust smoke and/or runs rough condition with or without an illuminated malfunction indicator light (MIL) with only diagnostic trouble codes (DICs) P0300, P0301-P0304, P0316, P0217, P1285 and/or P1299 stored in powertrain control module (PCM). This may be due to coolant intrusion into the cylinder. To resolve the condition, replace the short block and head gasket.

The contact owns a 2015 Ford Fusion. The contact stated while driving approximately 25 MPH and making a left turn at an intersection, the vehicle stalled. The contact stated that the check engine warning light illuminated 10 minutes prior to the vehicle losing motive power and stalling. The contact placed the vehicle in park(P) and was able to restart the vehicle. The contact stated that the vehicle stalled again after driving for several miles. The contact stated that the failure recurred, and the vehicle was towed to an independent mechanic. The vehicle was diagnosed, and it was determined that engine failed the compression test on all four cylinders. Additionally, coolant was leaking into cylinder #1 and #2. The mechanic determined that the failure was related to TSB: 19-2139, NHTSA ID Number: 10168739 (Engine and Engine Cooling). The vehicle had not been repaired. The manufacturer had been informed of the failure. The failure mileage was approximately 53,000.

The contact owns a 2015 Ford Fusion. The contact stated while driving approximately 15 MPH, the vehicle experienced a loss of power steering and the steering wheel seized. The "Power Steering Service” message was displayed. The contact stated that she was able to drive the vehicle back to the residence. The contact made a local dealer aware of the failure, but the vehicle was not diagnosed or repaired. The contact was made aware of NHTSA Campaign Number: 19V632000 (Steering) however, the VIN was not included in the recall. The manufacturer was made aware of the failure and the contact was advised to file a complaint with the NHTSA hotline. The approximate failure mileage was 109,000.

Car have trouble accelerating and shifting into gear. It started randomly sometimes it will shift extremely hard and then won’t accelerate after 45 minutes.

1. Front passenger brake hose split. 2. While driving the brake hose made an audible pop sound and fluid was released. Had I been driving at a high rate of speed (on an interstate) I could have created a multi-vehicle crash, potentially killing other drivers and, or myself. 3. I have a photo of the split hose. 4. I’ve inspected the issue myself and have photo evidence. It was not difficult to find the malfunctioned part. 5. No warning lamps or notices of failure. I’ve owned several cars, some much older than this current ford fusion and never had this issue with the brake hose. This could have been disastrous. I learned today that NHTSA opened a query into this potential issue in August 2022 and am recommending this be continued or reopened for investigation. This is not something to mess with, brake failure can be lethal.

After starting the car and turning on the seat heater Smoke started coming up from under the passenger seat smelling like it was burning.

I have bought this 2015 ford fusion brand new. In 2017 the problem of having the engine stalling started. I took the car to the dealership they din't find nothing wrong since than the problem has continued on and for 2 or 3 week. the injector have been cleaned air filter changed i even use a higher octane fuel. the problem has been going on for 5 years I have told the dealership several time Finaly on november 27 my car stopped in the middle of the road with the engine light on that never came on before. took it to AAA diagnostic: coolant leaking into cylinders.need new engine.It seems that this problem is recurant and can be dangerous on rush hours traffic

The contact called on behalf of her father who owns a 2015 Ford Fusion. The contact stated that while driving approximately 45 MPH, the check engine light illuminated, and the vehicle was misfiring. The vehicle was taken to an independent mechanic who diagnosed the vehicle and determined that spark plug #3 failed and needed to be replaced. The contact stated that all the spark plugs, and the coils were replaced; however, the failure persisted. The vehicle was taken to another independent mechanic who stated that the head gasket needed to be replaced. The vehicle was not repaired. The vehicle was taken to a third independent mechanic who diagnosed the vehicle and determined that the vehicle was receiving the incorrect fuel. The contact was advised to use Chevron fuel. The contact stated that the failure continued. The vehicle was finally taken to a Ford dealer where the failure was diagnosed as a blown head gasket; however, the vehicle was not repaired. The manufacturer was notified of the failure and advised the contact that the vehicle was not included in a recall and to contact the NHTSA Hotline for assistance. The contact related the failure to an unknown manufacturer recall for the head gasket however, the year, make, and model was not included in the recall. The approximate failure mileage was 65,000.

Engine has a misfire on cylinder #2. Documented at dealership and has same issue as Id number 10213732 or 21N12 under Ford Customer Service. Build date for our vehicle is 07/14 which is not covered by this T.S.B., but obviously has the same issue as the bulletin. Car misfires while driving, accelerating and decelerating. I believe the build dates should be expanded to all 1.5 ecoboost with this issue, which is coolant intrusion by a poorly engineered engine block.

Fuel Rail and vacuums are faulty. Gas remains over 1/2 a tank and vehicle stalls and shuts off while trying to drive. The engine shuts off while in drive . Acceleration is still not allowing for the car to run when starting and after a while the vehicle shuts off while driving.

Service department said that the Ford Fusion lug nuts are swelling and need to be replaced. Said they may be hard to get off or they could crack and break. I fill this should be a cost that Ford should pay or replace them for me. Not at my cost.

2015 FORD FUSION. CONSUMER WRITES IN REGARD TO FAULTY LUG NUTS. THE CONSUMER IS REQUESTING TO BE REIMBURSED FOR THE FAULTY LUG NUTS.

The contact owns a 2015 Ford Fusion. The contact stated that while his son was driving at highway speeds, the vehicle lost motive power and stalled without warning. His son was able to coast the vehicle to the shoulder of the highway and then had the vehicle towed to an independent mechanic. The contact was informed that antifreeze had leaked into an engine cylinder which resulted in engine failure. The vehicle was then towed to a dealer where they confirmed the failure and gave him an estimate for the repair. The manufacturer was notified of the failure and informed him that there were no recalls or warranty on the vehicle. The vehicle was not repaired and remained in the possession of the dealer. The failure mileage was approximately 91,000.

We having a problem with transmission failed. I noticed a recall for 2015 Ford Fusion. The car is running but stayed in limp mode and will not go over 40 mph.

Vehicle MIL came on while on the interstate in very heavy traffic. Lost power and almost caused a severe accident. Barely made it to shoulder. Dealer performed diagnostics and stated it was coolant intrusion into 1.5 liter ecoboost which destroyed the engine. Evidently this is a known problem with this engine which the manufacturer has not addressed.

I bought a 2015 Ford Fusion from a dealer in May 2022 i had only been driving the vehicle a month & 1/2 before it began to smoke really bad, so bad to where the drivers behind me visibility was affected....I made it home safely not knowing if the car would explode because of all the smoke and the smell, and the overheating of coolant and warning lights. I called the dealer I bought it from they said they couldn't help me cause it was past the few weeks they gave me to call them with issues, but said i can pay their mechanic to fix it for over $4000.00 which I do not have because I am on disability with a fixed income. I am still paying the note for this vehicle which I cannot drive and cannot afford to fix. It is just parked. I don't know what else to do, I took it to the Ford dealership near me and they said the engine needed to be replaced and would cost 10,442.00 which is more than what i owe on the car...I don't understand why there is no recalls for this vehicle and others that Ford and other dealers seem to know had or have this issue. I have read online and heard on YouTube so many people have had this same issue with their Ford vehicles and can't get any help to repair them. I am beyond frustrated that people can lie so easily, manipulate or con people into buying a product knowing it will not perform the way it is intended. I'm asking for a recall on all the Fords that have this issue with the coolant leaking in the cylinders of the engine or whatever to cause the en