The legendary turbo boxer of the WRX and Legacy. Iconic but demanding - head gaskets and worn coils are classic issues, and ignoring misfires under boost gets expensive fast.
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.
Cylinder 1 Misfire Detected
Combustion is repeatedly failing in cylinder 1. The ECU counts crankshaft speed fluctuations and attributes them to that specific cylinder.
Camshaft Position Timing Over-Advanced (Bank 1)
The intake camshaft timing is more advanced than commanded - the variable valve timing system is not responding correctly.
Crankshaft/Camshaft Position Correlation (Bank 1 Sensor A)
The crankshaft and camshaft positions do not match what the ECU expects - the mechanical timing may be off.
Fuel Pressure Regulator Performance
The fuel pressure regulator is not maintaining pressure within the expected range, even though its control circuit tests electrically fine.
Catalyst System Efficiency Below Threshold (Bank 1)
The downstream oxygen sensor shows the catalytic converter on bank 1 is no longer cleaning exhaust gases efficiently.
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