2015 Subaru WRX STI

The 2015 Subaru WRX STI is a performance-oriented sedan known for its turbocharged engine, all-wheel drive, and sporty handling. It came with a 2.5-liter turbocharged flat-four engine, producing 305 horsepower and 290 lb-ft of torque. It was only offered with a six-speed manual transmission. Owners typically love the car’s acceleration, handling prowess, and rally-inspired heritage. Common complaints include a stiff ride, road noise, and relatively poor fuel economy.

Engine

2.5L Turbocharged Flat-Four (EJ257)

• Ringland Failure/Piston Cracking
  • Description/Symptoms: This is a widespread issue. Symptoms can include loss of power, misfires, excessive oil consumption, knocking sounds, and eventually engine failure. It’s often triggered by aggressive tuning or high boost levels but can occur even on stock vehicles.
  • Solution: Engine rebuild or replacement with stronger pistons. Upgrading to forged pistons is a common preventative measure.
  • Estimated Cost to Fix: $5,000 - $10,000+ depending on the extent of the damage and if it is rebuilt or replaced.
  • Recalls: None Found
• Oil Consumption
  • Description/Symptoms: Many 2015 WRX STI owners report higher than normal oil consumption, sometimes requiring frequent top-offs between oil changes.
  • Solution: Sometimes switching to a higher viscosity oil can help. Other times it requires more invasive work like a piston ring replacement.
  • Estimated Cost to Fix: $50 - $200 for oil changes. $3,000 - $6,000+ for engine work.
  • Recalls: None Found
• Head Gasket Failure
  • Description/Symptoms: Overheating, coolant loss, white smoke from the exhaust, and/or coolant mixing with oil.
  • Solution: Head gasket replacement. It’s often recommended to machine the cylinder head surface to ensure proper sealing.
  • Estimated Cost to Fix: $2,000 - $4,000+
  • Recalls: None Found

Transmission

6-Speed Manual

• Synchro Wear/Grinding
  • Description/Symptoms: Difficulty shifting into certain gears, particularly 2nd and 3rd, accompanied by a grinding noise. This indicates worn synchronizers.
  • Solution: Transmission rebuild with new synchronizers.
  • Estimated Cost to Fix: $2,000 - $4,000+
  • Recalls: None Found
• Clutch Failure
  • Description/Symptoms: Clutch slippage, difficulty engaging gears, and/or a soft or spongy clutch pedal feel. Aggressive driving and/or increased engine power can accelerate clutch wear.
  • Solution: Clutch replacement. Consider upgrading to a stronger aftermarket clutch if the car is modified.
  • Estimated Cost to Fix: $1,000 - $2,500+
  • Recalls: None Found

Suspension

• No Issues Found

Electrical

• No Issues Found

Exterior

• Poor Trunk Struts
  • Description/Symptoms: The trunk lid slowly starts to droop due to weak struts. This can be frustrating as the trunk can smack you in the head as you’re putting stuff in.
  • Solution: Replace the struts.
  • Estimated Cost to Fix: $50-$150
  • Recalls: None Found

Interior

• Rattling
  • Description/Symptoms: Excessive rattling from various interior panels, particularly in the doors and dashboard.
  • Solution: Identifying and securing the loose panels. This may involve adding foam padding or tightening fasteners.
  • Estimated Cost to Fix: $0 - $500 depending on labor.
  • Recalls: None Found

Summary

The 2015 Subaru WRX STI, while a performance icon, is known to have some reliability issues, particularly with the engine. Ringland failure and oil consumption are the most concerning and potentially expensive problems. Transmission issues, like synchro wear, and interior rattles are also relatively common. Potential buyers should be aware of these potential issues and factor them into their purchasing decision. A pre-purchase inspection by a qualified mechanic is highly recommended.