2021 Subaru WRX STI

2021 Subaru WRX STI

Overview

The 2021 Subaru WRX STI, a performance-oriented compact sedan, is known for its robust all-wheel-drive system and engaging driving dynamics. While generally considered reliable for its class, like any performance vehicle, it can experience specific issues related to its high-strung powertrain and enthusiast-driven usage. Owners often praise its rally-bred heritage and track-capable performance. However, potential buyers should be aware of common areas that may require attention, particularly concerning the engine’s long-term durability under aggressive driving conditions and certain electronic features. This analysis focuses on documented technical reliability concerns beyond routine maintenance.

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Engine

2.5L Turbocharged Boxer (EJ257)

Head Gasket Failure

• Symptoms: Coolant loss, white smoke from exhaust, overheating, milky oil.
• Solution: Replacement of head gaskets, often with upgraded components.
• Cost: $1,500 - $3,000

Piston Ring Land Failure

• Symptoms: Excessive oil consumption, blue smoke from exhaust, loss of power, potential engine knock.
• Solution: Engine rebuild or replacement, often with forged pistons.
• Cost: $3,000 - $7,000+

Turbocharger Failure

• Symptoms: Loss of boost, whining noises, smoke from exhaust, reduced engine power.
• Solution: Turbocharger replacement or rebuild.
• Cost: $1,000 - $2,500

Transmission

6-Speed Manual (TY85)

Clutch Wear

• Symptoms: Slipping clutch, difficulty shifting gears, burning smell.
• Solution: Clutch kit replacement (clutch disc, pressure plate, release bearing).
• Cost: $800 - $1,500

Synchro Wear

• Symptoms: Grinding when shifting into certain gears, difficulty engaging gears.
• Solution: Transmission rebuild with new synchronizer rings.
• Cost: $1,500 - $3,000

Suspension

Performance Suspension

No widespread issues reported.

• Symptoms: N/A
• Solution: N/A
• Cost: Varies

Electrical

Standard Electrical System

Infotainment System Glitches

• Symptoms: Screen freezing, unresponsiveness, Bluetooth connectivity issues.
• Solution: Software update or head unit replacement.
• Cost: $100 - $800

Exterior

Body and Trim

No widespread issues reported.

• Symptoms: N/A
• Solution: N/A
• Cost: Varies

Interior

Cabin Components

No widespread issues reported.

• Symptoms: N/A
• Solution: N/A
• Cost: Varies

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Summary Verdict

The 2021 Subaru WRX STI offers a thrilling driving experience but comes with potential reliability considerations, primarily centered around its high-performance engine and manual transmission. The EJ257 engine, while powerful, is susceptible to issues like head gasket failure and piston ring land damage, especially if driven hard or not maintained meticulously. The 6-speed manual transmission can also experience wear on its clutch and synchronizers. Other systems like suspension, electrical, exterior, and interior generally hold up well, with only minor infotainment glitches being a notable concern. Prospective buyers should factor in the possibility of higher maintenance costs and potential repairs associated with performance driving.