Subaru OBD Codes: Meaning & Fixes

P0420 Powertrain The bank 1 catalytic converter no longer stores enough oxygen to clean the exhaust properly. Low P0171 Powertrain The engine computer is adding the maximum extra fuel it's allowed on bank 1 and still sees… Moderate P0700 Powertrain The transmission computer found a fault and asked for the check engine light – read the TCM… Moderate

B1650 Toyota · Body The airbag computer got an error from the passenger seat weight sensors and can't classify… Moderate P0011 Powertrain The bank 1 intake cam sits further advanced than the PCM asked for, usually an oil or control… Moderate P0021 Powertrain The bank 2 intake cam is more advanced than commanded or slow to respond; compare it with bank… Moderate P0026 Powertrain The oil-operated valve control on the bank 1 intake side isn't responding as commanded. Check… Low P0028 Powertrain A bank 2 valve lift solenoid didn't produce the expected result; low or old oil is the most… Low P0130 Powertrain The upstream oxygen sensor on bank 1 sent a signal the engine computer could not make sense of. Low P0133 Powertrain The upstream oxygen sensor on bank 1 still works, but it reacts to mixture changes too slowly. Low P0153 Powertrain Bank 2's front O2 sensor still switches, but too slowly between rich and lean; usually aged… Low P0171 Powertrain The engine computer is adding the maximum extra fuel it's allowed on bank 1 and still sees… Moderate P0328 Powertrain Knock sensor 1's signal is too strong: a short to voltage, electrical noise or a genuinely… Low P0410 Powertrain The cold-start air pump system that helps heat the catalytic converter didn't pass its… Low P0420 Powertrain The bank 1 catalytic converter no longer stores enough oxygen to clean the exhaust properly. Low P0700 Powertrain The transmission computer found a fault and asked for the check engine light – read the TCM… Moderate P2138 Powertrain The two sensors in the gas pedal report different pedal positions, so the PCM limits throttle… Moderate P2440 Powertrain The valve that should seal the air pump off from the bank 1 exhaust stays open, letting hot… Moderate P2441 Powertrain The air pump runs after a cold start, but the bank 1 valve won't open – no fresh air reaches… Low