2021 Subaru Forester Common Problems & Defect Telemetry
Authoritative defect intelligence synthesized from 207 verified NHTSA owner complaints, 0 federal safety recalls, and interquartile failure mileage telemetry.
The 2021 Subaru Forester receives a 6.9/10 MazicBay Reliability Index based on 207 verified NHTSA federal complaints and 0 safety recalls. The primary reported failure mode is Electric Power Steering Assist & Suspension Noise Reports with a median failure point at 7,925 miles (IQR: 1,726 – 35,750 mi). Out-of-warranty repairs benchmark at $450 – $1,400 .
13.8 complaints / 10k sold
Verified US federal records
Crash, fire & stall audit
0 Active / Free Remedies
Top Reported Problem Clusters (7)
Electric Power Steering Assist & Suspension Noise Reports
- Sudden loss of electric power steering assist
- Steering wheel pull or highway wander
- Clunking / knocking noise over bumps
“I am writing to file a formal complaint regarding repeated, severe, and dangerous malfunctions of the vehicle's engine Start/Stop (Idle Stop) feature. The system is failing to operate as intended, resulting in the engine stalling while the vehicle is in motion or under crucial...”
“Issue started with hearing a clunking noise from the front of the car, had the dealer inspect at 37,000 miles. They said they the clunking was caused by ECU issue and reprogrammed the ECU to correct it. Obviously, a software update did not correct the noise. Had an independent...”
“The contact owns a 2021 Subaru Forester. The contact stated that while stopped at a traffic signal, the vehicle stalled. No warning light was illuminated. The contact was able to restart the vehicle. The contact stated that on a separate occasion, while driving over railroad t...”
Engine Stalling, Oil Consumption & Cooling Defect Reports
- Engine sudden stall / hesitation while driving
- Abnormal oil burning / consumption
- Check Engine Light (MIL) flashing
- Engine overheating / coolant loss
“My 2021 Subaru Forester has a recurring, worsening defect in the Idle Stop/Start (ISS) system that creates a stalling hazard. When ISS shuts the engine off at a stop, the engine intermittently fails to restart when I try to move again. It cranks progressively slower, warning l...”
“Persistent Battery Drain on a 2021 Subaru Forester Limited. Problems began in year 4 of ownership (~17,000 mileage), after Subaru Starlink Subscription services expired. Red (Error) Starlink SOS indicator light was evident, where a normal light would show green. Battery would ...”
“Driving along and various system warnings came on, then started losing power, then the engine died and the car was completely dead. Got a jump start and the car ran for a couple of minutes and died again. Had it towed to a repair shop and when they checked it the next morning,...”
Electrical Parasitic Drain, Infotainment & Harness Reports
- Unexplained battery drain after sitting overnight
- Infotainment display / instrument cluster blackouts
- Accessory malfunction / alternator fault warnings
“The contact owns a 2021 Subaru Forester. The contact stated that while trying to roll up vehicle windows from driver sits and passenger sit they would roll up to 3/4th all the way up and they would roll back down after. The contact stated this was a recurring event. The dealer...”
“My 2021 Subaru Forester has a recurring, worsening defect in the Idle Stop/Start (ISS) system that creates a stalling hazard. When ISS shuts the engine off at a stop, the engine intermittently fails to restart when I try to move again. It cranks progressively slower, warning l...”
“Persistent Battery Drain on a 2021 Subaru Forester Limited. Problems began in year 4 of ownership (~17,000 mileage), after Subaru Starlink Subscription services expired. Red (Error) Starlink SOS indicator light was evident, where a normal light would show green. Battery would ...”
Service Brakes, ABS Actuator & Master Cylinder Reports
- Spongy or hard brake pedal travel
- ABS / Brake warning light illuminated
- Extended stopping distance / pedal vibration
“My 2021 Subaru Forester has a recurring, worsening defect in the Idle Stop/Start (ISS) system that creates a stalling hazard. When ISS shuts the engine off at a stop, the engine intermittently fails to restart when I try to move again. It cranks progressively slower, warning l...”
“Unintentional Acceleration - 2 times within 4 days of each incident. 9/17/25 while stopped to pull into a parking lot my 2021 Subaru Forester accelerated as I was stopped. I had to slam on the brakes, take a deep breath and was shocked at the pull and speed the car wanted to g...”
“On August 12, 2025, at approximately 10:16 AM, while driving at normal speed on CR-43 NW southbound just past Minnesota Ave in Big Lake, MN, my Subaru’s EyeSight Driver Assist System, specifically the Automatic Emergency Braking (AEB) / Pre-Collision Braking System, suddenly a...”
Transmission Hesitation, Hard Shifting & Slipping Reports
- Hard gear shifts / delayed engagement into Drive/Reverse
- Transmission shudder / jerking under acceleration
- Transmission slipping between gears
“My 2021 Subaru Forester has a recurring, worsening defect in the Idle Stop/Start (ISS) system that creates a stalling hazard. When ISS shuts the engine off at a stop, the engine intermittently fails to restart when I try to move again. It cranks progressively slower, warning l...”
“2021 Subaru Forester The vehicle has experienced recurring electrical and battery-related issues for several years. The original battery was replaced by the Subaru dealer with a larger-capacity battery because of repeated starting concerns. The replacement provided only tempor...”
“I am filing this complaint regarding a recurring and dangerous safety issue with my 2021 Subaru Forester. The auto stop/start feature intermittently fails to restart the engine after it shuts off when stopped. When this occurs, multiple dashboard warning lights come on, an ala...”
Airbag Occupant Detection & Inflator Defect Reports
- SRS Airbag warning lamp illuminated
- Passenger occupant classification sensor failure
- Seat belt retractor lockup
“The contact owned a 2021 Subaru Forester. The contact stated that while driving at approximately 4 MPH and slowing to park, the vehicle accelerated on its own. The contact stated that the vehicle drove out of the parking lot and crashed into a wall. The contact stated that the...”
“Automatic stop activated at traffic light. When the brake was disengaged, the star would not start. The occupant was stalled at the traffic light during rush hour in a thunderstorm with limited visibility for approximately 15 minutes. Winter Haven Police Department was dispatc...”
“The contact owned a 2021 Subaru Forester. The contact stated that his wife attempted to turn into a parking lot while her foot depressed on the brake pedal, the vehicle jolted into acceleration, ultimately crashing into two parked vehicles at 5 MPH. The front passenger side of...”
Fuel Pump Pressure Loss & Fuel Delivery Defect Reports
- Sudden loss of propulsion power at highway speeds
- Extended engine cranking / failure to restart
- Fuel odor near fuel tank / engine bay
“My 2021 Subaru Forester has a recurring, worsening defect in the Idle Stop/Start (ISS) system that creates a stalling hazard. When ISS shuts the engine off at a stop, the engine intermittently fails to restart when I try to move again. It cranks progressively slower, warning l...”
“While driving this car on April 4, 2026 at around 6PM, I experienced the distinct smell of gasoline. I had driven for about 5 minutes on our way to a local restaurant that is approximately an 8 minute drive from our residence. My wife said that she had just filled the gas tank...”
“The contact owns a 2021 Subaru Forester. The contact stated that while stopped at a traffic signal, the vehicle stalled. No warning light was illuminated. The contact was able to restart the vehicle. The contact stated that on a separate occasion, while driving over railroad t...”
Pre-Purchase Inspection Checklist for 2021 Subaru Forester
Before purchasing a used 2021 Subaru Forester, perform the following targeted inspections based on reported federal defect patterns:
Scan the OBD-II port under the dash for pending freeze-frame codes (e.g. P0300 misfires, P0087 fuel rail pressure, P0420 catalytic efficiency).
Test vehicle at low-speed stop-and-go and highway merges. Check for delayed reverse engagement or gear shift shudder between 2nd and 3rd gears.
Verify that all 0 NHTSA safety recall campaigns have been performed by an authorized dealership using the VIN.
Ensure the instrument cluster, center screen, and auxiliary charging ports operate with stable 12.0V–14.4V alternator voltage.
Defect & Reliability Q&A: 2021 Subaru Forester
Is the 2021 Subaru Forester a reliable used car?
The 2021 Subaru Forester earns a 6.9/10 MazicBay Reliability Index based on 207 federal owner reports. Vehicles maintained under factory service schedules exhibit strong longevity past 150,000 miles.
What is the most frequent defect reported on the 2021 Subaru Forester?
The leading complaint category is Electric Power Steering Assist & Suspension Noise Reports, with a median failure point around 7,925 miles (IQR: 1,726 – 35,750 mi).
Are there free recall repairs available for the 2021 Subaru Forester?
Yes, the NHTSA records 0 safety recall campaign(s) for this model year. All safety recalls are performed 100% free of charge by authorized franchise dealerships regardless of vehicle warranty status.