Opel Diagnostic Trouble Codes
Common OBD2 fault codes found on Opel vehicles with model-specific causes, known issues, TSBs, and adjusted repair cost estimates. Each guide is tailored for Opel owners.
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...
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 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
Astra H and J models with Z16XER and A16XER engines can throw P0600 due to a known issue with the EC...
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 commonly triggers P0741 above 120,000 km. The T...
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