Opel Diagnostic Trouble Codes
OBD2 fault codes seen on Opel vehicles, with what each code means, its typical repair cost range, and notes on specific Opel models.
Emissions
Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance
Opel Astra • 2004-2024
The 1.6L and 1.4L turbo engines (A16LET, A14NET) commonly trigger P0106 from vacuum hose deteriorati...
Manifold Absolute Pressure/Barometric Pressure Circuit Low
Opel Astra • 2004-2024
On Astra engines the MAP sensor mounts directly on the intake manifold behind the throttle body, hel...
Exhaust Gas Recirculation Flow Malfunction
Opel Astra • 2004-2024
The 1.7 CDTi (Z17DTH/A17DTJ) is very susceptible to EGR clogging, particularly in urban driving. The...
Exhaust Gas Recirculation (EGR) Flow Insufficient
Opel Astra • 2004-2024
The Astra CDTi diesel is the usual P0401 case, with the EGR valve sticking from soot and the intake ...
Catalyst System Efficiency Below Threshold (Bank 1)
Opel Astra • 2004-2024
On petrol Astra models with the 1.4 and 1.6 turbo units, P0420 commonly follows from an unfixed misf...
Fuel System
Fuel Trim Malfunction (Bank 1)
Opel Astra • 2004-2024
The 1.6L Z16XER and A16XER engines are prone to intake manifold gasket leaks that cause P0170. A com...
System Too Lean (Bank 1)
Opel Astra • 2009-2024
On Opel/Vauxhall petrol engines, P0171 is a common fault, especially on the 1.4 Turbo (A14NET, B14XF...
System Too Lean at Idle (Bank 1)
Opel Astra • 2004-2023
The Astra H and J with the Z16XER and A16XER engines trigger P2187 from intake manifold gasket failu...
System Too Rich at Idle (Bank 1)
Opel Astra • 2004-2023
The Astra with Z16XER and A16XER engines triggers P2188 primarily from a contaminated MAF sensor or ...
Misfire
Cylinder 1 Misfire Detected
Opel Astra • 2009-2024
On the 1.4 Turbo (A14NET/B14) the ignition cassette or individual coil over cylinder 1 is a common m...
Cylinder 2 Misfire Detected
Opel Astra • 2004-2024
The 1.4 Turbo (A14NET/B14NET) in Astra J and K models has documented ignition coil module failures c...
Ignition
EVAP System
Electrical
Vehicle Speed Sensor "A" Range/Performance
Opel Astra • 2009-2021
Astra J commonly triggers P0501 from front wheel speed sensor failure. The sensor and connector sit ...
Vehicle Speed Sensor "A" Circuit Low Input
Opel Astra • 2009-2021
Astra J commonly logs P0502 after a front wheel speed sensor takes water through its connector. The ...
Vehicle Speed Sensor "A" Intermittent/Erratic/High
Opel Astra • 2009-2021
Astra J commonly triggers P0503 alongside intermittent ABS warnings when road grime builds up betwee...
Serial Communication Link Malfunction
Opel Astra • 2004-2023
On Astra H and J models with Z16XER and A16XER engines, an ageing ECU main relay whose contacts deve...
ECM/PCM Processor Fault
Opel Astra • 2004-2024
Astra H and J models with Bosch and Delphi ECUs are sensitive to charging-system and ground problems...
Transmission
Output Speed Sensor Circuit Malfunction
Opel Astra • 2004-2023
The Astra H and J with the Aisin AF17/AF22 automatic transmission trigger P0720 due to the output sp...
Torque Converter Clutch Circuit Performance/Stuck Off
Opel Astra • 2004-2023
The Astra with the Aisin AF17/AF22 4-speed automatic can trigger P0741 at high mileage. The TCC sole...
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