Diagnostic trouble codes
Each is its own entry: what it means, which system and component it points at, the symptoms and causes mechanics report most, and the guides that go deeper.
ABS / Traction Control (1)
Valvetrain (1)
Fuel / air (7)
- P0101Mass air flow circuit range/performance1 guide
- P0171System too lean (bank 1)1 guide
- P0172System too rich (bank 1)2 guides
- P0299Engine underboost, actual boost below desired boost1 guide
- P2101Electronic throttle control system malfunction1 guide
- P219AAir-fuel ratio variation of cylinder, bank 11 guide
- P219BAir-fuel ratio variation of cylinder, bank 21 guide
Engine cooling (1)
Ignition (1)
Emissions control (7)
- P0401EGR flow insufficient detected1 guide
- P0420Catalyst system efficiency below threshold, bank 11 guide
- P20EESCR NOx catalyst efficiency below threshold, bank 11 guide
- P2440Secondary air injection system switching valve stuck open, bank 11 guide
- P2441Secondary air injection system switching valve stuck closed, bank 11 guide
- P2442Secondary air injection system switching valve stuck open, bank 21 guide
- P2445Secondary air injection system pump stuck off, bank 11 guide
Transmission (7)
- P0731Gear 1 shift incorrect ratio1 guide
- P0746Pressure control solenoid A performance or stuck off1 guide
- P0902Clutch A actuator control circuit low1 guide
- P090CClutch B actuator control circuit low1 guide
- P0965Pressure control solenoid B control circuit range or performance1 guide
- P17F0CVT judder, transmission inspection2 guides
- P17F1CVT judder, control valve inspection1 guide