The 2007 WRX is a highly tunable turbocharged boxer that suffers when owners modify boost or neglect maintenance. Stock examples can be reliable, but ringland failures and transmission weaknesses are real concerns at higher mileage.
Ringland Failure (Piston #4 / Cylinder #4)
Occasional · high severityTypical onset: 60,000-120,000 mi
Symptoms: misfires on cylinder 4, loss of compression, severe knock or rattle under load, white smoke from exhaust, metal shavings in oil
Fix: Complete engine rebuild or short block replacement required. Typically 16-22 labor hours for short block swap, includes removing turbo, headers, timing components, oil pan. Forged piston upgrade recommended at this point.
Estimated cost: $4,500-7,500
Head Gasket Failure (External Oil/Coolant Weep)
Common · medium severityTypical onset: 80,000-130,000 mi
Symptoms: oil weeping from head/block mating surface, coolant seepage visible externally, slight oil consumption increase, no overheating or mixing in early stages
Fix: Both head gaskets replaced, heads resurfaced if warped. Engine-out job preferred for thoroughness, 14-18 hours labor. Do timing belt, water pump, and all seals while apart.
Estimated cost: $2,200-3,800
5-Speed Transmission Synchro Wear (2nd Gear)
Common · medium severityTypical onset: 70,000-110,000 mi
Symptoms: grinding or crunching into 2nd gear, difficulty downshifting to 2nd, gear pop-out under deceleration, requires double-clutching to engage smoothly
Fix: Transmission removal and rebuild with 2nd gear synchro replacement, often includes input shaft. 8-12 labor hours for R&R and internal work. Clutch replacement recommended simultaneously.
Estimated cost: $2,000-3,200
Turbocharger Failure (Oil Starvation / Bearing Wear)
Occasional · high severityTypical onset: 90,000-140,000 mi
Symptoms: loud whine or whistle under boost, blue smoke on startup or acceleration, loss of boost pressure, excessive oil consumption, rattling noise from turbo
Fix: Turbo replacement with new or reman unit, 6-9 hours labor. Must replace oil feed and return lines, inspect banjo bolt filters for debris. Check engine for damage if metal passed through intake.
Estimated cost: $1,800-3,000
Transmission Mount Failure
Common · low severityTypical onset: 60,000-100,000 mi
Symptoms: clunking when shifting or launching, excessive drivetrain movement, vibration at idle in gear, shifter slop or misalignment
Fix: Rear transmission crossmember mount replacement, sometimes includes pitch stop mount. 1.5-2.5 hours labor, straightforward but requires lifting transmission slightly.
Estimated cost: $250-450
Throw-Out Bearing / Clutch Failure
Occasional · medium severityTypical onset: 50,000-90,000 mi
Symptoms: squealing or chirping with clutch pedal depressed, difficulty shifting into gear, clutch slippage under hard acceleration, chatter on engagement
Fix: Full clutch kit replacement including pressure plate, disc, throw-out bearing, pilot bearing. 6-8 hours labor for transmission removal. Inspect flywheel for hot spots or cracks, resurface or replace as needed.
Estimated cost: $1,200-1,900
Banjo Bolt Filter Clogging (Turbo Oil Feed)
Occasional · high severitySymptoms: turbo whine or failure at relatively low mileage, oil starvation to turbo even with clean oil, metal debris in oil if engine damage present
Fix: Remove turbo oil feed line banjo bolts, inspect screens for debris or metal. If clogged, flush oil system, replace filters, investigate source. 1-2 hours diagnostic and cleaning. Often precursor to turbo or engine failure if ignored.
Estimated cost: $150-350
Buy a bone-stock, well-maintained example with full service records and you'll get a fun, engaging car; buy a modded or neglected one and budget for an engine rebuild.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.