The 2011 Impreza with the 2.5L naturally-aspirated EJ253 engine is generally more reliable than its turbocharged siblings, but the notorious head gasket issue still haunts these cars, and CVT transmission problems (if so equipped) become expensive gambles at higher mileage.
Head Gasket Failure (External Leak)
Common · medium severityTypical onset: 90,000-150,000 mi
Symptoms: Oil weeping from the lower sides of the engine block, visible as crusty buildup, Coolant smell or small puddles under the car after sitting overnight, Slow coolant loss without visible leak from hoses or radiator, Oil consumption may increase slightly as seepage worsens
Fix: External head gasket replacement requires removing timing belt, camshafts, and heads. Smart shops resurface heads and replace timing components, water pump, and all seals while in there. 12-16 labor hours for thorough job.
Estimated cost: $1,800-2,800
CVT Transmission Judder and Failure
Occasional · high severityTypical onset: 80,000-130,000 mi
Symptoms: Shuddering or bucking sensation during acceleration, especially from stop or at low speeds, Whining or grinding noise under acceleration, Delayed engagement when shifting to Drive or Reverse, Check engine light with transmission-related codes (P0841, P0700)
Fix: CVT fluid changes can temporarily help early judder, but once internal clutch packs or belt wear too far, it's replacement territory. Used CVT swap runs 8-10 hours, remanufactured unit 10-12 hours. No rebuild option that's cost-effective.
Estimated cost: $3,500-5,500
Piston Ringland Failure (Less Common in NA 2.5L)
Rare · high severityTypical onset: 100,000-180,000 mi
Symptoms: Sudden increase in oil consumption (quart every 500-1,000 miles), Blue smoke from exhaust on startup or hard acceleration, Misfires on one cylinder, often with P0301-P0304 codes, Loss of compression in affected cylinder
Fix: Requires engine teardown, new pistons and rings minimum. Most shops recommend short-block replacement given labor overlap. 20-24 hours for short-block swap including gaskets, timing, and fluids.
Estimated cost: $4,000-6,500
Wheel Bearing Noise and Failure
Common · medium severityTypical onset: 70,000-120,000 mi
Symptoms: Humming or growling noise that increases with speed, changes with steering input, Noise louder during turns (left turn = right bearing, right turn = left bearing), Vibration felt through steering wheel or seat, ABS or traction control light may illuminate in advanced cases
Fix: Rear wheel bearings are pressed into hubs, requiring hub replacement (Subaru doesn't sell bearing separately). Front bearings can be pressed but most replace whole hub assembly. 2-3 hours per side including alignment check.
Estimated cost: $400-700 per corner
Airbag Inflator Recall and Brake Light Switch Failure
Common · high severitySymptoms: Takata airbag recall affects passenger-side inflator (safety risk), Brake lights staying on constantly or not working at all, Cruise control not engaging or disengaging randomly, Push-button start won't work (brake switch signal needed), Transmission won't shift out of Park
Fix: Takata recall is free at dealer but must be scheduled. Brake light switch is above the pedal, 0.5 hour job but cheap part fails repeatedly. Some owners replace every 2-3 years as maintenance item.
Estimated cost: $80-150 for brake switch; recall is $0
Transmission Mount Wear and Oil Cooler Line Leaks
Occasional · low severityTypical onset: 80,000-140,000 mi
Symptoms: Clunking when shifting into Drive or Reverse, Excessive engine movement visible when revving in Park, Vibration at idle that smooths out at higher RPM, Transmission fluid dripping from cooler lines at radiator (separate issue)
Fix: Transmission mount (rear) is notorious for tearing. Replacement is 1.5-2 hours. Oil cooler lines rust and crack where they meet the radiator; replacement involves draining coolant and ATF. 2-3 hours for lines.
Estimated cost: $250-400 for mount; $350-600 for cooler lines
Buy the manual transmission version under 100k miles with documented head gasket replacement, or budget $2,000-3,000 for eventual engine work—avoid high-mileage CVT cars unless you enjoy expensive gambles.
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.