2021 Subaru WRX STI

The 2021 Subaru WRX STI is a high-performance sedan known for its turbocharged engine, sporty handling, and iconic all-wheel-drive system. It came equipped with a 2.5-liter turbocharged horizontally-opposed four-cylinder (boxer) engine producing 310 horsepower and 290 lb-ft of torque. A six-speed manual transmission was the only transmission option available. Owners typically praise the car’s driving dynamics, turbocharged power, and overall performance capabilities. Common criticisms include the relatively low fuel economy, somewhat dated interior design, and firm ride quality.

Engine

2.5L Turbocharged Engine

• Excessive Oil Consumption
  • Description/Symptoms: Some owners have reported higher-than-normal oil consumption, requiring frequent top-offs between oil changes. This can manifest as a noticeable drop in the oil level on the dipstick.
  • Solution: The common solution is regular monitoring of oil levels and topping off as needed. In more severe cases, some owners have opted for engine rebuilds or replacements, but this is not a widespread issue.
  • Estimated Cost to Fix: Depends on the severity, ranging from the cost of oil to several thousand dollars for engine work.
  • Recalls: None Found
• Ringland Failure
  • Description/Symptoms: Ringland failure within the pistons can occur, especially with increased boost or aggressive tuning. Symptoms may include knocking noises, loss of power, increased oil consumption, and eventual engine failure.
  • Solution: Engine rebuild with stronger pistons.
  • Estimated Cost to Fix: $5,000 - $10,000+
  • Recalls: None Found
• Faulty Crank Position Sensor
  • Description/Symptoms: Engine stalling and/or not starting. Diagnostic Trouble Code (DTC) P0335 indicates a faulty crank position sensor.
  • Solution: Replace the crank position sensor.
  • Estimated Cost to Fix: $100 - $300+
  • Recalls: None Found

Transmission

6-Speed Manual Transmission

• Clutch Failure
  • Description/Symptoms: Premature clutch wear or failure can occur, especially with aggressive driving or modifications. Symptoms include slipping clutch, difficulty shifting, and unusual noises.
  • Solution: Clutch replacement.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found
• Difficulty Shifting into Certain Gears
  • Description/Symptoms: Some owners have reported issues with shifting into certain gears, particularly 1st or 2nd, especially when the transmission is cold.
  • Solution: Replacing the transmission fluid with a higher quality fluid such as Motul Gear 300 or Redline MT-90
  • Estimated Cost to Fix: $100 - $200+
  • Recalls: None Found

Suspension

• No Issues Found

Electrical

• Head Unit Freezing/Rebooting
  • Description/Symptoms: The infotainment system can sometimes freeze or reboot unexpectedly, particularly during navigation or while using Apple CarPlay/Android Auto.
  • Solution: Software updates from the dealer or aftermarket head unit replacement.
  • Estimated Cost to Fix: $0 (if a software update resolves the issue) to $500-$1500+ (for aftermarket head unit)
  • Recalls: None Found
• Dead Battery
  • Description/Symptoms: Premature battery failure.
  • Solution: Battery replacement.
  • Estimated Cost to Fix: $100 - $300+
  • Recalls: None Found

Exterior

• No Issues Found

Interior

• Rattling/Buzzing Noises
  • Description/Symptoms: Various interior components may develop rattles or buzzing noises over time, particularly in the dashboard or door panels.
  • Solution: Identifying the source of the noise and securing the loose components.
  • Estimated Cost to Fix: Varies, potentially minimal if DIY, otherwise $100 - $500+ at a shop.
  • Recalls: None Found

Summary:

The 2021 Subaru WRX STI, while a performance-oriented vehicle, does have some common issues. The most concerning potential issues are related to the engine (oil consumption and ringland failure), which can lead to costly repairs. The infotainment system can be a source of frustration, and general maintenance items like clutches may require replacement sooner than expected if the car is driven aggressively. Overall, while the STI is a fun and capable car, potential buyers should be aware of these potential issues and factor them into their purchasing decision.