The 1999 Impreza represents the second-generation platform with decent reliability, but the 2.5L engines are notorious for head gasket failures while the 2.2L is more durable. Expect typical Subaru AWD maintenance and watch for rust in snow-belt states.
Head Gasket Failure (2.5L Engine)
Common · high severityTypical onset: 80,000-130,000 mi
Symptoms: External oil seepage from cylinder heads, White exhaust smoke on cold start, Coolant loss with no visible leaks, Overheating under load, Milky oil on dipstick (advanced failure)
Fix: Both head gaskets require replacement, typically with machine shop resurfacing. 12-16 hours labor. Multi-layer steel aftermarket gaskets recommended over OEM. Timing belt, water pump, and all seals should be done simultaneously since engine is apart.
Estimated cost: $1,800-2,800
Piston Ring Land Failure (2.5L Engine)
Occasional · high severityTypical onset: 100,000-180,000 mi
Symptoms: Excessive blue smoke on acceleration, High oil consumption (1 quart per 500-1000 miles), Loss of compression in one or more cylinders, Rough idle and misfires, Metallic rattling from engine
Fix: Ringlands crack on piston #4 typically. Requires complete engine rebuild or short block replacement. 18-24 hours labor for short block swap. Many owners opt for used JDM engine as cheaper alternative.
Estimated cost: $3,500-5,500
Transmission Oil Cooler Line Corrosion
Common · medium severityTypical onset: 80,000-150,000 mi
Symptoms: Transmission fluid leak near radiator, Red fluid dripping from front of vehicle, Transmission slipping or delayed engagement (if fluid level drops), Burned transmission fluid smell
Fix: Steel lines rust through where they connect to radiator. Replace both cooler lines and clamps. 2-3 hours labor. Flush transmission fluid afterward. Common in salt-belt states.
Estimated cost: $300-550
Front Wheel Bearing Failure
Common · medium severityTypical onset: 70,000-120,000 mi
Symptoms: Grinding or humming noise that increases with speed, Noise changes when turning left or right, Vibration through steering wheel, ABS light may illuminate
Fix: Hub assembly replacement required (bearing not serviceable separately on this generation). 2-3 hours per side. AWD vehicles harder on bearings due to constant power delivery.
Estimated cost: $250-400 per side
Rear Suspension Lateral Link Bushing Deterioration
Common · low severityTypical onset: 90,000-140,000 mi
Symptoms: Clunking over bumps from rear, Wandering rear end over rough roads, Uneven rear tire wear, Vehicle feels unstable in turns
Fix: Replace lateral link bushings or entire lateral links. OEM rubber bushings last 80k-100k. Aftermarket polyurethane available for better longevity. 3-4 hours labor for all four lateral links.
Estimated cost: $400-700
Fuel Pump Failure
Occasional · high severityTypical onset: 120,000-180,000 mi
Symptoms: No start condition with cranking, Engine dies while driving, Sputtering under acceleration or load, Hard starting when fuel tank below half, Whining noise from rear when key is on
Fix: In-tank pump replacement. Access through rear seat removal. 2-3 hours labor. OEM pumps are reliable; aftermarket often fail prematurely.
Estimated cost: $400-650
Headlight Wiring Harness Melting
Occasional · medium severitySymptoms: Intermittent headlight operation, One or both headlights flickering, Burned plastic smell from engine bay, Headlight connector melted or discolored, Headlight bulbs burn out frequently
Fix: Corroded bulb sockets or cheap high-wattage aftermarket bulbs cause excessive resistance and melting. Replace headlight connectors with upgraded pigtails and use OEM-spec bulbs. 1-2 hours. Related to NHTSA recalls on exterior lighting.
Estimated cost: $150-300
Buy a 2.2L model with service records and expect a reliable commuter; avoid 2.5L engines unless head gaskets are already done or you have $2k set aside.
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.