Most common 2021 Subaru Legacy problems
Share of the 31 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
Subaru Legacy complaints by model year
Best Legacy years: 2023, 2025, 2021. Years to avoid: 2015, 2016, 2011, 2020, 2019. Compare all years →
2021 Subaru Legacy recalls (3)
Air bags › Sensor › Occupant classification › Front passenger
Subaru of America, Inc. (Subaru) is recalling certain 2020-2022 Outback and Legacy vehicles. A capacitor in the sensors for the Occupant Detection System (ODS) may crack and short circuit, which can prevent the front passenger air bag from deploying in a crash.
Remedy: Dealers will replace the ODS sensors on the front passenger seat, free of charge. Owner notifications were mailed February 3, 2025. Owners may contact Subaru customer service at 1-844-373-6614.
Power train › Automatic transmission › Park/neutral start interlock switch
Subaru of America, Inc. is recalling certain model year 2021 Crosstrek, 2022 Forester, 2021-2023 Legacy, and Outback vehicles. An insufficient weld may allow water to enter the inhibitor switch, causing it to fail.
Remedy: Dealers will replace the inhibitor switch, free of charge. Owner notification letters were mailed January 8, 2024. Owners may contact Subaru customer service at 1-800-782-2783. Subaru's number for this recall is WRQ-23.
Power train › Driveline › Chain/belt
Subaru of America, Inc. (Subaru) is recalling certain 2020-2021 Outback and Legacy vehicles. A programming error in the Transmission Control Unit (TCU) may allow the clutch to engage before the drive chain is completely clamped.
Remedy: Dealers will reprogram the TCU, inspect TCU data for chain slip, and visually inspect the chain guide. If evidence of chain slippage or damage is found, the transmission will be replaced.
What 2021 Subaru Legacy owners say
Windows, wipers & sunroof
The contact owns 2021 Subaru Legacy. The contact stated while entering the vehicle, she noticed a crack on the passenger's side of the front windshield that expanded to the center of the windshield. The contact was unsure what caused the crack in the windshield. The contact reached out to the local dealer and was informed that the vehicle would not be repaired unless the contact paid for the glass warranty. The vehicle was not inspected nor diagnosed. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was 1,100.
The component that failed is the windshield. The windshield has a 14 inch stress crack. The crack suddenly appeared, there was no impact. The crack interferes with the Subaru Eyesight Driver Assistance. The Subaru Eyesight Driver Assistance could malfunction while driving. The integrity of the windshield has been compromised. I brought the car to the Subaru dealership and they said it was not covered under warranty even though the car only has 6,000 miles on it. The Subaru dealership said they took pictures of the windshield and submitted them to Subaru of America. Subaru of America will not replace the windshield. According to Subaru when the windshield is replaced the Eyesight Driver Assistance must be recalibrated adding an additional expense.
Air bags
A Recall was issued Mar 22, 2024 for a dangerous safety issue. AN AIR BAG That Does NOT Deploy During A Crash CAN Increase THE Risk OF Injury. Remedy Dealers Will Replace THE ODS Sensors ON THE Front Passenger Seat, Free OF Charge. Interim Letters Informing Owners OF THE Safety Risk Were Mailed MAY 17, 2024. Owners Will Receive A Second Letter Once THE Remedy IS Available. Owners MAY Contact Subaru Customer Service AT [phone]. Subaru's Number FOR This Recall IS Wra-24. NHTSA issued their Recall for this problem. NHTSA Recall Number24V227000 Recall Status Recall Incomplete, remedy not yet available Now 8 months later Subaru drivers are still forced to drive around with this dangerous defect. This is totally unacceptable, irresponsible and local Subaru dealers have received no part for this repair and have not idea when they will ever get them. …
The contact owns a 2021 Subaru Legacy. The contact received notification of NHTSA Campaign Number: 24V227000 (Air Bags); however, the part to do the recall repair was not yet available. The local dealer was contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.
Electrical system
The contact owns a 2021 Subaru Legacy. The contact stated that while driving at various speeds during colder weather, the heater failed to operate as intended. Additionally, the Eyesight system was inoperable. The check engine and other unknown warning lights were displayed. In addition, the contact stated that the engine failed to warm up as intended after being started, and the engine temperature was 107 F, which was below the normal engine temperature of 200 F. The vehicle was taken to a local dealer, where it was diagnosed, and determined that the Thermal Control Valve needed to be replaced. The contact related the failure to Technical Service Bulletin: 09-119-24; however, the vehicle was not repaired because the vehicle had a Salvaged Title. The manufacturer was made aware of the failure. The failure mileage was approximately 60,000.
Battery died completely, left me stranded at a gas station. I had to call and get a jump. I've had the car 9 weeks, it only has 690 miles on it. No warning lights prior, did notice a slightly longer crank a couple days prior. I was told by the dealer that I don't drive enough, and I should keep my key at least 30 feet away when the keys are in the house, because that can silently drain the battery. I had not left any lights on or had done anything to drain the battery prior to this occurring. I drove to the gas station with no problem, upon restarting after getting gas, no power, car was dead. I couldn't even move the shifter knob into neutral.
2021 Subaru Legacy engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined |
|---|---|---|---|
| 2.5L 4-cyl | CVT | AWD | 27 / 35 / 30 |
| 2.4L 4-cyl turbo | CVT | AWD | 24 / 32 / 27 |
EPA ratings. Class: Large car.
Frequently asked questions
Is the 2021 Subaru Legacy a good car?
Based on 31 owner complaints filed with NHTSA, the 2021 Legacy rates better than average: 50% fewer complaints than a typical year of the Legacy at the same age. It is one of the best Legacy years by this measure. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2021 Subaru Legacy?
The windows, wipers & sunroof — 6 complaints, 19% of all complaints for this model year, most often about windshield. Next are the air bags (6) and electrical system (5).
How many recalls does the 2021 Subaru Legacy have?
There are 3 recalls for the 2021 Subaru Legacy, the most recent from March 22, 2024 (front passenger). Recall repairs are free at any authorized dealer — check whether yours has been done with the VIN recall check.
What are the best and worst years of the Subaru Legacy?
The best years by complaints, compared at the same age, are 2023, 2025 and 2021. Years to avoid or approach with caution: 2015, 2016, 2011, 2020 and 2019. See the full Subaru Legacy years comparison.
At what mileage do 2021 Subaru Legacy problems happen?
The median mileage reported in complaints is about 5,000 miles; 75% of problems with a recorded mileage started before 50,000 miles.
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.