Which parts fail
Components named in complaints (engine, cooling system, oil leaks, timing chain, exhaust).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2017 Subaru Forester owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2017 Subaru Forester. The contact stated while driving at an undisclosed speed, the check engine warning light illuminated, and several safety features failed to function as intended. In addition, the contact stated that the check engine warning light had been illuminated intermittently for over a month prior to a diagnostic test. The vehicle was taken to the dealer where DTC code: P0420 was retrieved, and the vehicle was diagnosed with catalytic converter failure. The contact was informed that the catalytic converter needed to be replaced. The vehicle was scheduled to be repaired. The contact researched Warranty Extension: 09-84-22; however, the contact was informed that the repair was not covered under any warranty programs. In addition, the contact stated that the case manager provided false information and stated that the Warranty Extension document did not exist. …
On May 20, 2022, I was attempting to back into a parking space when my car lunged forward and crashed into two parked cars. I suffered a cracked sternum. No one else was hurt but I was just a few feet from the ground-level windows of a motel. Much body damage to my car (in excess of $13,000) and the other two cars. Police report was filed. Insurance claim filed. No reproduction of problem sought from manufacturer or dealer. No warning signals from car. Assumption made of driver at fault accident. However, please refer to Detroit Free Press article printed 4/22/23: https://freep-mi.newsmemory.com/?publink=0dd2ac172_134ab3a
The contact owns a 2017 Subaru Forester. The contact stated that while the vehicle was being started, the contact heard an abnormally loud sound coming from the engine. The contact stated that a dealer was contacted. The vehicle was taken to a dealer where it was diagnosed and determined that the catalytic converter needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The manufacturer referred the contact to the NHTSA Hotline to report the failure. The approximate failure mileage was 156,774.
With engine running and shift lever in Park (CVT transmission) driver is unable to turn the engine off or remove the ignition key from the steering wheel. This occurs sporadically/unpredictably such that driver has no forewarning and cannot take proactive steps to avoid the problem, resulting in instances where driver is forced to leave the car running in situations that present safety concerns. (Examples: in a garage or enclosed area; when temporarily exiting vehicle necessitating leaving the doors unlocked; etc.). The problem is widespread in Subaru vehicles and consistent with problems exhibited/described in Subaru Technical Service Bulletin (TSB) #16-112-18R for which no recall has to date been issued for corrective action by Subaru. …
I was pulling into a parellel parking space, braking to slow to a stop when my car surged froward inspite of increased and continued braking and hit the car in front of me. The collision is what stopped the car. My Subaru Forester is very damaged (bumper, lights, and frame rail) and the car in front also had extensive damage. My safety and the safety of the neigbhorhood cars, pedestrians and homes was at risk given my car was unstoppable despite braking. I couldn't understand what happened so I did an internet search for acceleration while braking and many articles came up reguarding several Subaru models (including mine) of "sudden unintended acceleration" issues. What was described was exactly what I experienced. There are several class action lawsuits in the works as Subaru has not taken any responsibility. No dashboard warning lights came on before or after the crash. …
On July 31,2023, approximately 8PM, I was driving my 2017 Subaru slowly as I made the 90degree turn into my driveway. Midway up the driveway, the car suddenly -on its own-spontaneously accelerated , burst through the half open garage door, across the garage, and crashed through the garage wall into my family room-bulldozing through two sheets of plywood and large pieces of firewood in the garage, and then destroying heavy antique furniture in the family room before coming to rest. The jagged remains of the wall prevented opening either the passenger or the driver's side door. My adult son, [redacted] , was my passenger in the front seat. He climbed to the back, but the hatch has no handle on the inside, so we were trapped in the car. I called 911. Police and Fire departments arrived. …
After driving the vehicle I will arrive at my destination. I will stop, continue pressing the vehicle break while moving the shifter from drive to park. Then, I turn the key to the off position in an attempt to remove my key from the Ignition. About 40-50% of the time, the key can not be removed. In order remove the key I will have to do one of the following: Option 1. Let my foot of of the break, pause, then press my foot hard on the break peddle, move to shifter from park to drive, while continuing to press my foot down hard on the break peddle, move the shifter back from drive to the park position. Often I will have to repeat this process several times to remove the key form the ignition or attempt Option 2.. Option 2. …
the TGV valve metal flap screw came undone and came loose with the intake manifold. piece of metal about 1 in x 2 inch (flap) fell down to cylinder 2 intake and rubbed against the intake valve nipping pieces off and those pieces of metal along with loose screw fell chipping corner of cylinder 2 top edge. at my shop they had to replace cylinder 2 and TGV valve and rebuild the damaged cylinder head. REASON WHY I TOOK IT TO THE SHOP There was small vibrations at a idle at about 800 rpm (stationary) and already replaced the spark plug and fuel injector and it still shook little bit. since i couldn't figure out what was the issue decided to take it to a mechanic. about a week prior to dropping the car off at the mechanics I heard a metal clinking in the engine for a minute and went away. after that the Miles per gallon went from 27 down to 25 miles per gallon. …
My 2017 Subaru Forester has 52,000 miles driven. Recently the ignition key will NOT turn to start the engine. The transmission was in park and all the doors were fully closed. After 15 minutes trying several times to no avail it did finally turn to the right and the engine started. Also, previously a few times, randomly, the key would not turn all the way to to the left to turn the engine off. Again, the car was in park and I kept my foot on the brake while trying. Each time this happened I had to move the transmission from Part to Drive and back to Park again, (while keeping my foot on the brake) and the key finally turned all the way to turn the engine off. I am now bringing the car to a Subaru dealer service shop (in Annapolis, Maryland) to try to have them repair this problem once and for all. Thank you, [redacted].
Noticed sputtering in my car. Took it to dealership. I was told I needed condenser and compressor. When googled, there was a recall for condenser for Subaru Forester 2017 model. The dealership told me that it's only vin# specific for that reason not covered under recall. That was a shock. Same model and year but they would only cover certain vin #? For the same known issue? Why? It should cover all vin # for the safety of the consumer. I am writing to report the issues encountered so far with this vehicle. 1. Batteries were leaking prematurely, I got it replaced 4 months ago 2. Need condenser and compressor replaced at less than 60,000 miles for a newly car purchased car from dealership. Please look in to this issue if reported by more consumers for safety reason and also to hold the company accountable for faulty parts. Thank you.
Engine complaints in other Forester years
Frequently asked questions
How common are engine problems on the 2017 Subaru Forester?
NHTSA has 48 complaints about the engine & cooling of the 2017 Subaru Forester, 8% of the model year's 592 complaints. The component named most often is exhaust system › emission control › catalytic convertor (1 mentions).
Is there a recall for 2017 Subaru Forester engine problems?
No. NHTSA lists no engine & cooling recall for the 2017 Subaru Forester, though it has 1 recall 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 2017 Subaru Forester engine problems start?
Half of the complaints with a recorded mileage happened before about 20,000 miles, and 57% before 25,000 miles.
Is it dangerous?
Owners linked 4 crashes, 0 fires and 1 injury 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.