The EJ's successor in the WRX - more modern direct injection, but still sensitive to overboost and overheating under aggressive driving.
Click a code for the full breakdown: symptoms, causes, and whether you can keep driving.
Random/Multiple Cylinder Misfire Detected
The engine control unit detects misfires occurring randomly across multiple cylinders, meaning combustion is failing intermittently in more than one cylinder.
Turbocharger Overboost Condition
Boost pressure exceeded the safe limit - the wastegate or boost control is not relieving pressure.
Turbocharger Underboost
The turbo is producing less boost pressure than the ECU requests.
Knock Sensor Circuit Malfunction
The knock sensor signal is invalid - the ECU can no longer detect detonation and retards timing defensively.
System Too Lean (Bank 1)
The engine is getting too much air or too little fuel on bank 1 - the ECU has hit the limit of its ability to compensate.
Fuel Pressure Regulator Performance
The fuel pressure regulator is not maintaining pressure within the expected range, even though its control circuit tests electrically fine.
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