Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2018 Subaru Forester owners, lightly cleaned up (personal details are redacted by NHTSA).
Sudden unexplained acceleration incident. Car accelerated without input from driver and rear-ended a parked vehicle in front of the vehicle Eyesight system did not engage to warn or prevent impact with rear end of car in front. The vehicle was travelling at low speed and suddenly accelerated. This is dangerous because it does not provide enough time to prevent from hitting an object in front of the vehicle like a car or person. The problem has not been reproduced by by the manufacturer who sent a technician who inspected the vehicle and could not find any saved info in the event data recorder or saved diagnostics codes. Complaints were filed with the dealership before the incident that the eyesight system did not appear to be functioning correctly. The first time this has happened was 6/02/2021 in the afternoon on a clear day on a clear pathway without any obstructions. …
Sudden unexplained acceleration incident. Car accelerated without input from driver and rear-ended a parked vehicle in front of the vehicle Eyesight system did not engage to warn or prevent impact with rear end of car in front. The vehicle was travelling at low speed and suddenly accelerated. This is dangerous because it does not provide enough time to prevent from hitting an object in front of the vehicle like a car or person. The problem has not been reproduced by by the manufacturer who sent a technician who inspected the vehicle and could not find any saved info in the event data recorder or saved diagnostics codes. Complaints were filed with the dealership before the incident that the eyesight system did not appear to be functioning correctly. The first time this has happened was 6/02/2021 in the afternoon on a clear day on a clear pathway without any obstructions. …
I was driving on a normal roadway when a pulley began to make a loud screaming sound. Then I heard two loud pops. I pulled to the side of the road. I found a melted serpentine belt. I replaced the belt and began to drive at a low speed. I noticed the Vehicle started to sputter. I pulled over and checked the engine. When I opened the hood the AC compressor was sparking and 6-12 inch flames were shooting out. I turned off the engine and extinguished the fire. Vehicle operated like normal after replacing AC compressor. Concerned that it could have caught entire vehicle on fire. Condenser for same make and model is recalled but not for our specific vin. I have old AC pump as evidence. An argument could be made that my VIN should have been included in the recall.
The contact owns a 2018 Subaru Forester. The contact stated while driving 30 MPH, the vehicle started shaking abnormally. The contact pulled over, stopped, turned off, and restarted the vehicle. After the vehicle was started, smoke started coming from the vehicle while several unknown warning lights illuminated. The vehicle was towed to the dealer to be diagnosed. The contact was informed that the spark plugs needed to be replaced. The vehicle was then taken to an independent mechanic and the contact was informed that the fuel pump needed to be replaced. The vehicle was not repaired. The manufacturer was not contacted. The failure mileage was approximately 38,000.
Front end collision with car making an illegal left in front of our Subaru. Our car hood, bumper, head lights, grill and parts of the engine were smashed, with liquid draining out of the engine. My husband (wearing a seatbelt) hit his knee and shoulder on impact. Airbags failed - Not a single airbag deployed. A police officer helped him move car parts out of the street. Safety was at risk because my husband hit the dash. Car is at an independent service center now. We need to know how to get it inspected. There were no warning lights on dash prior to impact.
In June 2022 I purchased a 2018 Subaru Forester Turbo Touring at Carmax. Soon after purchase the car hesitated a few times when I was turning. I was turning in front of oncoming traffic and it scared the ___ out of me. So I returned the car to CarMax and bought a similar replacement which is the VIN reported to you in this report. After a couple of months, this car is now doing the same thing , generally when turning but sometimes when merging into traffic. I press the gas, the car moves a bit, then it just dies - there's nothing there, simply no response. It does not turn off, it is just powerless. Then a few seconds later it gets gas and we squeal to safety. However I am just dead in the water, usually in front of oncoming traffic, until it decides to move. Pumping the gas does not help. …
For the second time we were on the freeway at a hight speed and the car suddenly lost power, all the warning lights came on, and we had to get off the freeway (dangerously). We almost got hit, and other cars had to brake radically. We took it in to Subaru and they said the catalytic converter was bad. They replaced the catalytic converter, and when they took it for a test ride, they found that the SECOND catalytic converter was bad. Apparently they have two. The car must have suddenly lost power for them, too. We have 85k miles on the car, and the Subaru warranty for the catalytic converter is 80k. We're into it for thousands of dollars, but the MOST IMPORTANT reason I'm making this report is that SOMEONE IS GOING TO GET KILLED ON THE FREEWAY because of these failing catalytic converters, and it might not be people in the Subarus. …
While driving the vehicle I began to hear a loud grinding noise from the engine compartment when the A/C was engaged. I pulled over to look under the hood and it sounded like the noise was coming from the serpentine belt. Upon inspection by a Subaru dealership it was determined that the A/C compressor is failing. I was informed that there was a known issue with the 2018 Forester A/C compressor and the compressor has been redesigned. I was also informed that if I postponed repair then the compressor could seize up with would cause the serpentine belt to break which would then cause immediate engine failure. Such failure could be extremely dangerous if it happens when driving on a highway, etc. There was no warning light that appeared when the grinding noise started. I also listen to music when I drive so it was lucky that I heard the noise before the compressor seized. …
Yesterday 6/19/25 I was driving out the driveway when the vehicle accelerated on its own, and not slowly, but like it had been punched. I was actually coasting at the time since I didn't want to stir up dust. My foot was not on the gas pedal. And it was not the floor mat. It happened on its own, the first time in 87,000 miles. It probably cannot easily be replicated as it was completely random, although now that it's happened once, it very well could happen again if there's a faulty or aging part or sensor. Neither the local dealer nor Subaru has acknowledged the problem (I called both today) but it's a SERIOUS safety issue. No check engine light or other means of warning. It just happened out of nowhere. Glad I was in the driveway and not in town waiting while a pedestrian was crossing the street.
After starting the car for the first time of the day, letting it warm for a minute or two, I started driving and when I went to stop at a stop sign about three blocks from my starting point I pressed the brake. The engine started to rev immediately so I had to stomp the brake to the floor and push the gear selector to the neutral position to avoid hitting a pedestrian and the dog she was walking. She was within 10 feet of the front of my car when I finally stopped. I have not taken it to a dealer yet since I am sure they will not be able to replicate the intermittent problem. There were no warnings of any kind that this was about to happen. I did note though, that the cold engine temperature indicator light on the dashboard was still illuminated.
Engine complaints in other Forester years
Frequently asked questions
How common are engine problems on the 2018 Subaru Forester?
NHTSA has 32 complaints about the engine & cooling of the 2018 Subaru Forester, 6% of the model year's 498 complaints.
Is there a recall for 2018 Subaru Forester engine problems?
No. NHTSA lists no engine & cooling recall for the 2018 Subaru Forester, though it has 3 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2018 Subaru Forester engine problems start?
Half of the complaints with a recorded mileage happened before about 21,000 miles, and 58% before 25,000 miles.
Is it dangerous?
Owners linked 6 crashes, 1 fire and 4 injuries to engine & cooling problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.