This Bulletin provides the diagnostic procedure for the STARLINK® Remote Engine Start (RES).
full bulletin at NHTSA ↗2008 Subaru Impreza engine problems
severe 29 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
29
Recalls
0
Avg fix
$3,100
1crash
1injury
When does it fail?
Of the 29 engine complaints filed for the 2008 Subaru Impreza, here's the actual mileage breakdown — failures cluster heaviest at 0-25,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Owners have filed 29 engine complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Among the 14 model years of Subaru Impreza in our records for engine problems, this one ranks #3 by owner-complaint volume.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This Service Information Bulletin provides the Service Manual Correction to the diagnostic procedure for DTC B2A16 (Immobilizer Key Collation Diagnosis).
full bulletin at NHTSA ↗This Bulletin announces the diagnostic procedures to be followed when diagnosing engine oil leakage on FA and FB type engines.
full bulletin at NHTSA ↗The purpose of this bulletin is to advise of SOA’s revised Catalytic Converter Recycling Program shipping procedure.
full bulletin at NHTSA ↗This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners report a dominant pattern of piston ringland failures—cracked or broken ringlands predominantly on pistons #2 and #4—occurring anywhere from 1,200 to 33,000 miles. Symptoms include white smoke on cold startup, loss of power at low RPM and under light throttle, rough idle, excessive oil consumption, and dramatic power loss under acceleration. Compression tests show cylinder pressure drops (one owner documented cylinder #4 at 100 psi vs. 115–125 psi on others; another saw #4 at 50–70 psi, far below spec). Several owners report the failures are nearly impossible to detect without tear-down—one noticed only mild degradation while running on 3.5 cylinders. Ringland breakage leads to severe blowby, fuel in the oil, and if left unchecked, engine seizure that can happen in minutes during aggressive driving. One owner's engine seized mid-maneuver, creating an oil slick hazard. Dealers initially struggled to diagnose the problem; one owner brought his car in multiple times before ringland failure was found. Some owners suspect detonation sensitivity tied to aggressive OEM tuning combined with weak cast pistons. Additional engine issues include oil leaks from head gaskets and valve covers (one repaired under NHTSA campaign 08V460000 but recurred), connecting rod bearing failures, and cold-start stalling due to dropped RPM to zero during warm-up in cold weather. One owner reported rough idle, engine shudder, and immediate shutdown when accelerating, though the dealer found only a leaking valve. Low-mileage failures dominate the complaints, with several occurring under 20,000 miles despite full oil changes and regular maintenance.
Same Subaru Impreza engine reports on nearby years: 2006 · 2007 · 2009
Failure modes owners describe
Piston ringland failure
Cracked or broken ringlands on pistons (most commonly #2 and #4) causing compression loss, blowby, and oil consumption. Owners report Subaru initially denied widespread problem despite internet forums showing many affected vehicles. Some failures occurred after engine replacement under warranty, suggesting design defect.
When: 1,200 to 33,000 miles
Symptoms owners cite: White smoke on cold startup; Power loss at low RPM and under light throttle; Rough idle; Excessive oil consumption; Stumbling at 3,000 RPM; Dead spots in power band throughout RPM range; Loss of acceleration
Codes mentioned: P0301, P0302, P0303, P0304
Repairs/costs cited: Bottom end or short block replacement; one owner paid partial cost under goodwill repair before ringland failure was confirmed. Cost not documented. One piston was replaced at private shop after dealer refused compression test.
Recalls/TSBs owners mention: Subaru issued a stop sale on some 2008 WRX models; some owners received goodwill repairs. One owner reported dealership refused warranty claim citing lack of maintenance records. NHTSA campaign 08V460000 addressed some engine issues. Subaru told some owners the car runs as designed.
Head gasket leak
Premature head gasket failure allowing oil to leak onto hot engine surfaces, creating fire hazard. One owner cited incorrect factory gasket sizing as root cause. Leaks recurred within two weeks of initial dealer repair in at least one case.
When: Varies; one recurrence at 119,000 miles after prior repair
Symptoms owners cite: Oil leaking from engine; Smoke coming from front of vehicle; Oil film on windshield
Repairs/costs cited: Valve covers initially replaced, then oil return line clamps; ultimately oil feed line replacement required. Repair cost exceeded $2,000 in one case.
Recalls/TSBs owners mention: Repaired under NHTSA campaign 08V460000 (Engine and Engine Cooling) in one case; however, failure recurred post-repair and dealer could not diagnose or repair the second occurrence.
Engine seizure due to oil loss
Complete engine stoppage caused by severe oil loss from blowby related to ringland failure or bearing degradation. Can occur within minutes during aggressive driving, creating sudden loss of power on highway.
When: As early as 77,000 miles; can occur minutes after symptom onset
Symptoms owners cite: Engine knocking; Power loss; Squealing; Engine will not restart
Repairs/costs cited: Complete engine replacement required; one owner quoted $10,000 replacement cost at 77,000 miles.
Connecting rod bearing failure
Rod bearing failure on crankshaft causing knocking, shaking, and running poorly. One owner experienced this as a follow-up issue after initial ringland repair. Appears tied to debris from ringland failures or underlying engine assembly defects.
When: At 79,000 miles on one vehicle; shortly after ringland repair on another
Symptoms owners cite: Knocking noise from engine; Shaking and clicking; Running poorly; Power loss
Repairs/costs cited: Engine long block replacement required.
Recalls/TSBs owners mention: One owner received re-manufactured engine for warranty repair, which owner objected to since vehicle came with factory engine.
Cold-start rough idle and stalling
RPM drops to zero during warm-up period in cold weather, causing engine stall when clutch is depressed to shift. Occurs consistently and creates loss of power steering and power braking mid-maneuver.
When: Early in ownership; 22,500 miles on one vehicle
Symptoms owners cite: RPM drops to zero during warm-up; Engine stalls when depressing clutch; Loss of power steering; Decreased power braking; Engine vibration and rumbling on startup
Codes mentioned: P0301, P0302, P0303, P0304
Repairs/costs cited: Dealership attempted repair multiple times (three visits documented in one case) without finding root cause.
Engine vibration and rumbling on startup
Vibration and rumbling every time vehicle is started. Dealer inspection found nothing wrong in one case.
When: Present from purchase
Symptoms owners cite: Engine vibration; Engine rumbling on startup
Recalls/TSBs owners mention: Dealer found no issue.
Oil leaking from valve cover
Oil seepage from valve covers, with recurrence even after initial repair.
When: At 119,000 miles on one vehicle
Symptoms owners cite: Oil leaking from engine; Smoke from front of vehicle
Repairs/costs cited: Valve covers replaced; failure recurred.
Engine shutdown under acceleration
Engine shuts down immediately when accelerator is pressed, accompanied by loud shudder. Lights remain on; vehicle restarts immediately. Occurred twice in one documented case.
When: Early in ownership
Symptoms owners cite: Loud shuddering; Immediate engine shutdown; Vehicle restarts without issue
Repairs/costs cited: Dealer could not duplicate problem but found leaking valve covered under warranty.
Synthesized from 29 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
Piston #4 had ringland failure of both ringlands on said piston in my 2008 Subaru wrx sti. *tr
Had engine trouble with your 2008 Subaru Impreza?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2008 Subaru Impreza?
It's a meaningful issue. 29 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $3,100.
At what mileage does the engine typically fail?
Across the 26 complaints that reported odometer mileage, most engine failures cluster between 11,000 and 48,500 miles, with the median around 28,000. A quarter of owners report trouble before 11,000; a quarter make it past 48,500. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2008/Subaru/Impreza.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.