CriticalAffects 2008-2014
WRX STI Rod Knock / Spun Bearing (EJ257)
Catastrophic engine failure on EJ257 engines, commonly referred to as "rod knock," is typically caused by a spun connecting rod bearing leading to severe damage.
Last updated: 2026-05-15
Repair cost
$5,000–$10,000
DIY difficulty
5 / 5
Severity
Critical
Engine, safety, or drivability — fix before driving
Affected
2008-2014
What goes wrong
The EJ257 engine is known for premature and catastrophic connecting rod bearing failure. This often begins with degradation of the bearing
Symptoms to watch for
- Loud knocking sound from engine, especially on cold start or under acceleration
- Loss of oil pressure
- Check Engine Light (P0301-P0304, P0011, P0021, etc.)
- Metallic particles in engine oil
- Engine seizure
Root cause
The EJ257 engine
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Permanent fix
- Complete engine rebuild with forged internals and upgraded bearings
- Replacement with a new or remanufactured short block
- Upgraded oiling system components (oil pick-up, oil pump)
FAQ
What causes wrx sti rod knock / spun bearing (ej257)?
The EJ257 engine
How much does it cost to fix?
National average $5,000–$10,000.
Is this a DIY repair?
Difficulty 5/5. Complete engine rebuild with forged internals and upgraded bearings
What are the symptoms?
Loud knocking sound from engine, especially on cold start or under acceleration; Loss of oil pressure; Check Engine Light (P0301-P0304, P0011, P0021, etc.); Metallic particles in engine oil; Engine seizure