Subaru · Known Issues
2021 Subaru Forester Problems: 11 Known Issues
2021 model year · 3,200+ owner reports · Updated September 2026
2021 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
2021 model year · 3,200+ owner reports · Updated September 2026
2021 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
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According to Au7o's analysis of 3,200+ owner reports, the 2021 Subaru Forester has 11 documented known issues, with 2 rated critical. The most serious are CVT Transmission Shudder and Premature Failure ($0-$8,000 repair) and EyeSight False / Phantom Automatic Emergency Braking. The most commonly reported issue is CVT Transmission Shudder and Premature Failure with 1,800 owner reports. Across all issues with published estimates, repair costs range from $60 to $8,000. DIY maintenance guides at au7o.io.
WHEELS
Subaru of America, Inc. (Subaru) is recalling certain 2025 Forester vehicles equipped with 18" aluminum alloy wheels. The wheels may have been manufactured with an incorrectly specified lug seat surface, which can result in the wheel being improperly attached and cause a loss of vehicle stability.
CHILD SEAT
Subaru of America, Inc. (Subaru) is recalling certain 2025 Forester vehicles. The child seat anchor bolts may have been improperly tightened, allowing the bolts to come loose.
EQUIPMENT:OTHER:LABELS
Subaru of America, Inc. (Subaru) is recalling certain 2026 Crosstrek Hybrid, 2025-2026 Forester Hybrid, Forester, and 2019-2026 Ascent vehicles. These vehicles were manufactured with an incorrect Gross Axle Weight Rating (GAWR) on the certification label. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) 110, "Tire selection and rims."
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According to Au7o's analysis of 3,200+ owner reports, the 2021 Subaru Forester has 11 documented issues. The most frequently reported are: CVT Transmission Shudder and Premature Failure, EyeSight False / Phantom Automatic Emergency Braking, Windshield Spontaneous Cracking Near EyeSight Camera. Of these, 2 are rated critical and should be addressed promptly.
The 2021 Subaru Forester has 11 known issues documented across 3,200+ owner reports. 2 issues are rated critical: CVT Transmission Shudder and Premature Failure and EyeSight False / Phantom Automatic Emergency Braking. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
Repair costs for known Subaru Forester issues range from $0 to $8,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, CVT Transmission Shudder and Premature Failure, typically costs $0-$8,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
The Lineartronic CVT (TR690) in 2014-2021 Foresters can develop shuddering, hesitation, and in severe cases, complete failure. Symptoms typically begin around 60,000-100,000 miles. The CVT chain can stretch, causing slippage and shudder during light acceleration. The torque conve… Repairs typically run $0-$8,000. Severity: high.
Forester owners report the EyeSight pre-collision braking system applying hard braking with no obstacle present, including on open highways and curves, plus erratic lane-keep-assist interventions, all attributed to the windshield-mounted stereo-camera assembly. A class action ove… Severity: high.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
ENGINE AND ENGINE COOLING
Subaru of America, Inc. (Subaru) is recalling certain 2024 Forester vehicles. The engine water pipe may have loose attachment bolts, allowing the pipe to lose its seal and leak coolant.
POWER TRAIN:DRIVELINE:DRIVESHAFT
Subaru of America, Inc. (Subaru) is recalling certain 2024 Crosstrek, Impreza, 2023-2024 Forester, and 2023 WRX vehicles. The front driveshaft assemblies' outer race may develop cracks and break.
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5th generation Foresters (2019+) have widespread reports of windshield cracks initiating near the EyeSight camera housing area or from the edges with no impact. The windshield design incorporates an acoustic interlayer and EyeSight camera calibration zone that creates stress conc… Repairs typically run $500-$1,500. Severity: medium.
Coil-on-plug ignition coils on the Forester are a common failure point. As the coil's internal epoxy/resin cracks with heat and age, the coil produces erratic or insufficient spark, causing single-cylinder misfires, rough idle, hesitation on acceleration, reduced fuel economy and… Repairs typically run $60-$350. Severity: medium.
Forester moonroofs drain rainwater through small tubes routed down the A/B pillars to discharge under the car. The corner drains clog with pollen, dirt and tree debris, or a tube pops off its nipple at the sunroof gutter. Water then backs up and overflows into the headliner and c… Repairs typically run $0-$350. Severity: medium.
Foresters commonly throw a P0420 'Catalyst System Efficiency Below Threshold (Bank 1)' code and an illuminated check-engine light. While the converter itself is the part that degrades, the underlying root cause on FB25 Foresters is frequently the well-documented excessive-oil-con… Repairs typically run $200-$2,200. Severity: medium.
The Harman-built Starlink head unit on 5th-gen Foresters freezes on startup, reboots in a loop every few seconds, or goes to a black/blank screen, often after a software update. Subaru issued TSB 15-228-18R covering 2019-2020 Forester (among other models) for display freeze-up or… Severity: medium.
Foresters are prone to early front brake rotor distortion (thickness variation) that produces a pronounced pulsation/judder felt through the steering wheel and brake pedal when braking, often appearing at relatively low mileage. Owners across multiple generations report warped/ju… Repairs typically run $300-$700. Severity: medium.
For 2019 the SK Forester switched the FB25 from port injection to direct injection. With no fuel washing over the back of the intake valves, oil vapor from the PCV system bakes onto the valves and ports as hard carbon. Deposits restrict airflow and disturb valve sealing, and once… Repairs typically run $150-$900. Severity: medium.
The boxer engine's two valve covers face outward and sit low on each side, exposing the cork/rubber valve cover gaskets and the spark plug tube seals to heat cycling and the path of any leaking oil. As these seals harden and shrink, oil seeps out and visibly drips onto the exhaus… Repairs typically run $250-$700. Severity: medium.
Foresters routinely wear the inner edges of the rear tires bald at low mileage (often 20,000-30,000 miles). The rear suspension allows toe adjustment but not camber, and the factory frequently leaves the rear toe set too aggressively, scrubbing the inner shoulders. Because owners… Repairs typically run $100-$250. Severity: low.