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2021 Subaru Outback Maintenance Schedule

Manufacturer-recommended service intervals and open recall alerts for your 2021 Subaru Outback.

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Recalls4Full scheduleKnown issues7

How Subaru schedules service

Subaru's symmetrical AWD system places unusually high demands on differential fluid and transfer case service — skipping these is the most common cause of premature drivetrain wear. Older Subarus with the EJ25 engine (pre-2011) require timing belt replacement; FB and FA engines (2011+) use a maintenance-free chain. Subaru's published intervals below align with the owner's manual Schedule II (severe) which most US drivers qualify for.

⚠️

4 Open Recalls

Source: NHTSA

POWER TRAIN:SHIFT LINKAGE/CABLE/ROD

Campaign #21V024000 · Jan 26, 2021

Issue: Subaru of America, Inc. (Subaru) is recalling certain 2021 Outback and Impreza vehicles. The continuously variable transmission (CVT) select lever cable nut may not have been tightened properly, allowing the nut to loosen.

Risk: A loose nut can lead to a lost of retention in the CVT select lever cable and the gear selector not functioning properly, increasing risk of crash.

Fix: Subaru will notify owners, and dealers will inspect, and, if necessary, tighten the nut, free of charge. The recall began February 12, 2021. Owners may contact Subaru customer service at 1-844-373-6614. Subaru's number for this recall is WRA-21.

POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)

Campaign #22V485000 · Aug 7, 2022

Issue: 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.

Risk: An improperly secured drive chain may slip and break, causing a loss of drive power and increasing the risk of a crash.

Fix: 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. Repairs will be performed free of charge. Owner notification letters are expected to be mailed August 24, 2022. Owners may contact Subaru's customer service at 1-844-373-6614. Subaru's number for this recall is WRK-22. This recall is an expansion of previous recall number 21V-955.

POWER TRAIN:AUTOMATIC TRANSMISSION:PARK/NEUTRAL START INTERLOCK SWITCH

Campaign #23V755000 · Sep 11, 2023

Issue: 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.

Risk: An inoperative inhibitor switch may prevent the reverse lights from illuminating and the rearview camera image from displaying, increasing the risk of a crash.

Fix: 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.

AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION:FRONT PASSENGER

Campaign #24V227000 · Mar 22, 2024

Issue: 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.

Risk: An air bag that does not deploy during a crash can increase the risk of injury.

Fix: 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. Subaru's number for this recall is WRA-24.

Recall data refreshed Jul 26, 2026.

Essential maintenance

Critical for safety and preventing major damage

🛢️

Engine Oil & Filter

Every 6,000 mi

Replace 0W-20 full-synthetic oil and filter every 6,000 miles. WRX/STI 2.0L/2.5L turbo: 3,750 miles. Non-turbo FB engines: 6,000 miles severe / 10,000 normal.

Estimated cost — typical U.S. ranges

Dealer

~$120–$160

Shop

~$85–$115

DIY

~$25–$55

Full synthetic costs more than conventional. 5-quart 0W-20 + filter is the typical bill.

🔄

Tire Rotation

Every 7,500 mi

Rotate tires every 7,500 miles. Critical on Subaru AWD — uneven tread depth across all 4 tires (>2/32") forces the center differential to bind, damaging the AWD coupling.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Often free at the shop where you bought the tires — worth asking before paying.

🛑

Brake Inspection

Every 7,500 mi

Inspect brake pads, rotors, calipers, and parking brake every 7,500 miles. Outback and Forester pads commonly last 35,000-50,000 miles depending on terrain.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Most shops do this free as a courtesy with any service. Don't pay separately if you can avoid it.

🔧

Front Differential / Manual Transmission Fluid

Every 30,000 mi

Replace front differential and manual transmission fluid every 30,000 miles. CVT models use proprietary Subaru CVT fluid — a separate item.

Estimated cost — typical U.S. ranges

Dealer

~$150–$195

Shop

~$105–$135

DIY

~$20–$50

🔩

Rear Differential Fluid

Every 30,000 mi

Replace rear differential fluid every 30,000 miles. Use Subaru 75W-90 GL-5 — substitutes can cause whining noises within months.

Estimated cost — typical U.S. ranges

Dealer

~$150–$195

Shop

~$105–$135

DIY

~$20–$50

⚙️

CVT Fluid (Lineartronic)

Every 30,000 mi

Subaru CVT models (Outback, Legacy, Forester, Crosstrek, Impreza, Ascent): replace Lineartronic CVT fluid every 30,000 miles severe / 60,000 normal. Subaru High-Torque CVT-II fluid only — incorrect fluid destroys the chain-and-pulley system.

Estimated cost — typical U.S. ranges

Dealer

~$360–$500

Shop

~$255–$355

DIY

~$80–$180

CVT fluid is manufacturer-specific and pricey — do NOT substitute conventional ATF.

⏱️

Timing Belt (EJ25 engines, pre-2011)

Every 105,000 mi

Older Subarus with the EJ25 boxer engine (Forester, Outback, Legacy 1996-2010): replace timing belt every 105,000 miles. FB and FA boxer engines (2011+) use a chain — no scheduled replacement.

Estimated cost — typical U.S. ranges

Dealer

~$935–$1175

Shop

~$655–$825

DIY

Pro only

On interference engines, a snapped belt destroys valves. Worth doing on schedule. Bundle water pump + tensioner — labor is already there.

🧪

Brake Fluid

Every 30,000 mi

Replace DOT 3 brake fluid every 30,000 miles or 30 months. Subaru's brake hold and EyeSight automatic emergency braking depend on uncontaminated fluid.

Estimated cost — typical U.S. ranges

Dealer

~$180–$200

Shop

~$125–$140

DIY

~$10–$25

DOT 3 or 4 — match the cap. Vacuum bleeders make this a one-person DIY.

Important maintenance

Keeps your vehicle running smoothly and efficiently

💨

Engine Air Filter

Every 30,000 mi

Replace engine air filter every 30,000 miles. WRX/STI: inspect every oil change due to the higher airflow demand of the turbo intake.

Estimated cost — typical U.S. ranges

Dealer

~$60–$95

Shop

~$45–$70

DIY

~$15–$40

5-minute job on most cars; the airbox lid usually has clips, no tools needed.

⚡

Spark Plugs

Every 60,000 mi

Iridium plugs every 60,000 miles on FB engines. WRX/STI 2.5L turbo: 30,000 miles due to higher cylinder pressures and EGT.

Estimated cost — typical U.S. ranges

Dealer

~$285–$390

Shop

~$200–$275

DIY

~$25–$100

Iridium plugs cost more but last 100k+ miles. V6/V8 access varies wildly — some are tough.

🌡️

Super Coolant

Every 30,000 mi

Subaru Super Coolant (blue): first change at 137,500 miles or 11 years, then every 30,000 miles. Do not substitute green or orange — head gasket sealing chemistry depends on the formula.

Estimated cost — typical U.S. ranges

Dealer

~$285–$330

Shop

~$200–$235

DIY

~$25–$60

Use the manufacturer-specified coolant — wrong color/chemistry can damage the cooling system.

Recommended maintenance

Extends the life of your vehicle and improves comfort

🌬️

Cabin Air Filter

Every 15,000 mi

Replace cabin air filter every 15,000 miles. Behind the glove box on most Subaru models.

Estimated cost — typical U.S. ranges

Dealer

~$60–$95

Shop

~$45–$70

DIY

~$15–$40

Usually behind the glovebox. Shops charge labor for a 10-minute job — easy DIY win.

Known issues for this vehicle

What drivers and federal regulators have officially reported about the 2021 Subaru Outback.

Reported to NHTSA

Spontaneous windshield cracking

VISIBILITY/WIPER

75 NHTSA complaints · 2021-10 → 2024-10 (sample of 200 most-recent of 290 total)

“The contact owns a 2021 Subaru Outback. The contact stated while driving 50 MPH approaching a traffic light, the contact heard an abnormal cracking sound coming from the front windshield. The contact noticed a small crack on the driver’s side of the windshield that spread to the…”
— Owner report, NHTSA ODI #11446410
“Subaru has a known issue with windshields being easily cracked. I purchased a new 2021 Subaru Outback Onyx XT and had to replace the windshield 2 times within the first year of owning due to cracked windshield, both happened after having a small chip from likely a small rock…”
— Owner report, NHTSA ODI #11507567

Read all complaints on NHTSA →

Battery drain and no-start condition

ELECTRICAL SYSTEM

26 NHTSA complaints · 2021-12 → 2026-06 (sample of 200 most-recent of 290 total)

“Battery is draining for no apparent reason. As stated in several class action law suits, defects in these vehicles ( Subaru Outback 2015-2020) cause the batteries to drain, replacement batteries also drain. The Subaru Outback battery drains because of the Controller area network…”
— Owner report, NHTSA ODI #11473993
“The battery does not hold a charge. I have had to have AAA charge my battery on 10 occasions in the fourteen months since I purchased this vehicle. I also have had to have the battery jumped by friends to start the car. The battery was replaced by the dealership in early…”
— Owner report, NHTSA ODI #11453302

Read all complaints on NHTSA →

Thermo control valve failure

ENGINE

13 NHTSA complaints · 2022-06 → 2026-05 (sample of 200 most-recent of 290 total)

“I was driving and suddenly 13 flashing lights and codes from check engine to loss of cruise control and RAB -dealer says it needs a new thermo control valve (thermostat). This failed part has been common on Subarus for 3 years-reported on internet and even to the point where a…”
— Owner report, NHTSA ODI #11543033
“Thermo control valve failure. Would not cover it”
— Owner report, NHTSA ODI #11620185

Read all complaints on NHTSA →

Sunroof glass shattering while driving

UNKNOWN OR OTHER

6 NHTSA complaints · 2021-12 → 2025-10 (sample of 200 most-recent of 290 total)

“Sunroof exploded driving home in 90 degree sunny and clear weather. It sounded like a gun went off right over my head. It scared me so bad I jerked my steering wheel into the other lane. Thank God no one was in that lane. I had to get it replaced at Mid State Glass company.…”
— Owner report, NHTSA ODI #11690946
“On[XXX] while accelerating to travel speed (45 mph) on a rural Maine highway, the little used glass moon roof of our 2021 Subaru Outback Touring with 24,100 miles on the odometer exploded with a huge, shocking BANG!. Weather was clear and bright, wind ~5 mph, temperature about…”
— Owner report, NHTSA ODI #11591890

Read all complaints on NHTSA →

Infotainment screen blackout and reboot

ELECTRICAL SYSTEM

19 NHTSA complaints · 2021-10 → 2023-12 (sample of 200 most-recent of 290 total)

“The infotainment system is so buggy and slow it's dangerously distracting. It crashes all the time and takes a few minutes to reboot which is not good when you're using navigation. The volume randomly will go to 100% and the only way to fix it is to restart the car. I've had it…”
— Owner report, NHTSA ODI #11482923
“THE MAIN COMPUTER SYSTEM THAT CONTROLS THE EYESIGHT SYSTEM, CRUISE CONTROL, LANE DEPARTURE, ALL HVAC CONTROLS, NAVIGATION, ETC. SHUTS DOWN (GOES BLACK), AND REBOOTS RANDOMLY. WHEN THIS OCCURS, ALL OF THE FUNCTIONS AND CONTROLS ASSOCIATED WITH THE COMPUTER SYSTEM ARE LOST. CRUISE…”
— Owner report, NHTSA ODI #11453768

Read all complaints on NHTSA →

Air bag recall parts unavailable

AIR BAGS

11 NHTSA complaints · 2024-07 → 2025-09 (sample of 200 most-recent of 290 total)

“The contact owns a 2021 Subaru Outback. The contact received notification of NHTSA Campaign Number: 24V227000 (Air Bags); however, the part to do the recall repair was unavailable. The dealer was contacted. The dealer confirmed that parts were not yet available for the recall…”
— Owner report, NHTSA ODI #11686038
“The contact owns a 2021 Subaru Outback. The contact stated while driving at an undisclosed speed, the air bag warning light illuminated. The contact stated that there was an audible chime while a passenger was seated in the front passenger’s seat. The contact received…”
— Owner report, NHTSA ODI #11638838

Read all complaints on NHTSA →

Unintended acceleration at low speed

VEHICLE SPEED CONTROL

10 NHTSA complaints · 2022-04 → 2025-12 (sample of 200 most-recent of 290 total)

“While slowly backing out of a parking space, the vehicle suddenly accelerated on it's own - I do not recall pressing on the accelerator but the engine surged and the vehicle rapidly reversed and struck 4 other parked cars. It felt as if the accelerator became stuck and would not…”
— Owner report, NHTSA ODI #11679036
“The contact owns a 2021 Subaru Outback. The contact stated that while idling at a red traffic light, the vehicle lurched forward twice and struck the rear end of another vehicle twice. Several unknown warning lights were illuminated upon impact. The air bags did not deploy.…”
— Owner report, NHTSA ODI #11689975

Read all complaints on NHTSA →

Issues on other model years

  • 2018 Subaru Outback →
  • 2019 Subaru Outback →
  • 2020 Subaru Outback →
  • 2022 Subaru Outback →
  • 2023 Subaru Outback →
  • 2024 Subaru Outback →

Source: NHTSA Office of Defects Investigation (ODI). Complaint data refreshed Jul 27, 2026. Investigation data refreshed Jul 27, 2026.

We display NHTSA's record with attribution; we don't editorialize on what these complaints mean for any specific vehicle.

Typical U.S. ranges. Actual quotes vary by shop, parts choice, and vehicle condition.

How we estimate: Dealer = OEM parts × 1.4 + labor × $165/hr. Shop = parts + labor × $115/hr. DIY = parts only.

This maintenance schedule for the 2021 Subaru Outback reflects Subaru's published service intervals. Your actual service needs may vary based on driving conditions, climate, and vehicle usage. Always consult your owner's manual for model-specific recommendations.

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