Opel Diagnostic Trouble Codes
OBD2 fault codes seen on Opel vehicles, with what each code means and the Opel models it shows up on. Each code's page has its typical repair cost range.
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Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance
- Opel Astra • 2006-2015
On the turbocharged Astra petrol engines (1.6 Z16LET in the Astra H, 1.4 A14NET in the Astra J) the MAP…
Manifold Absolute Pressure/Barometric Pressure Circuit Low
- Opel Astra • 2004-2024
Before ordering a MAP sensor, open its connector and look for green or white deposits on the pins.
Exhaust Gas Recirculation Flow Malfunction
- Opel Astra • 2004-2010
The Astra H (2004-2010) is offered with the 1.7 CDTi diesel (Z17DTL, Z17DTH, Z17DTJ and Z17DTR).
Exhaust Gas Recirculation (EGR) Flow Insufficient
- Opel Astra • 2004-2024
Catalyst System Efficiency Below Threshold (Bank 1)
- Opel Astra • 2004-2024
Test the downstream O2 sensor before replacing the cat.
Exhaust Gas Recirculation "A" Control Circuit High
- Opel Insignia A 2.0 CDTI 160 (A20DTH, also in the Saab 9-5 2.0 TiD) • 2008-2013
The Insignia 2.0 CDTI 160 uses the A20DTH diesel, the same engine as the 2010-2012 Saab 9-5 2.0 TiD. Saab's…
Fuel System
Fuel Trim Malfunction (Bank 1)
- Opel Astra • 2006-2015
The Astra's 1.6 litre Z16XER and A16XER petrol engines are naturally aspirated.
System Too Lean (Bank 1)
- Opel Astra • 2009-2024
On the Astra, P0171 usually comes from air entering after the MAF sensor: a split intake boot or charge pipe…
System Too Lean at Idle (Bank 1)
- Opel Astra • 2004-2023
P2187 means the engine control sees more air than fuel at idle on bank 1, so unmetered air after the air mass…
System Too Rich at Idle (Bank 1)
- Opel Astra • 2004-2023
A contaminated mass airflow sensor can often be cleaned with a dedicated MAF cleaner.
Misfire
Cylinder 1 Misfire Detected
- Opel Astra • 2009-2024
To find a faulty coil, swap it with the coil of a neighbouring cylinder: if the misfire moves with the coil…
Cylinder 2 Misfire Detected
- Opel Astra • 2004-2024
To find a faulty coil, swap it with the coil of a neighbouring cylinder: if the misfire moves with the coil…
Ignition
EVAP System
Evaporative Emission System Purge Control Valve Circuit
- Opel Insignia A 2.0 Turbo (A20NHT, also in the Saab 9-5 2.0T) • 2008-2013
Saab's workshop information for the A20NHT 2.0 turbo petrol, the engine the 2010 Saab 9-5 2.0T shares with…
Evaporative Emission System Leak Detected (Large Leak)
- Opel Corsa • 2006-2024
Electrical
Vehicle Speed Sensor "A" Range/Performance
- Opel Astra • 2009-2021
Vehicle Speed Sensor "A" Circuit Low Input
- Opel Astra • 2009-2015
On the Astra J, P0502 can be set by a wheel speed sensor connector that has corroded or lost contact. Clean…
Vehicle Speed Sensor "A" Intermittent/Erratic/High
- Opel Astra • 2009-2021
Clean the sensor face and check the reluctor ring for dirt or damage before replacing the sensor.
Serial Communication Link Malfunction
- Opel Astra • 2004-2023
A voltage supply fault to the engine control unit can also set P0600, so the battery and the ECU supply are…
ECM/PCM Processor Fault
- Opel Astra • 2004-2024
A weak battery or a poor ground connection is the cheapest cause of a processor fault code to rule out, so…
Throttle Actuator Control Range/Performance (Bank 1)
- Opel Vectra C 2.2 DTI (Y22DTR) • 2002-2004
Hella's workshop tip for the Vectra C with the 2.2 DTI diesel links P0638 to sporadic power loss, poor…
Throttle Actuator "A" Control Motor Circuit Range/Performance
- Opel Insignia A 2.0 Turbo (A20NHT, also in the Saab 9-5 2.0T) • 2008-2013
- Opel Insignia A 2.0 CDTI (A20DTH, also in the Saab 9-5 2.0 TiD) • 2008-2013
Transmission
Output Speed Sensor Circuit Malfunction
- Opel Astra • 2004-2023
On an Astra with an automatic gearbox, P0720 refers to the output speed sensor circuit. Check the sensor's…
Torque Converter Clutch Circuit Performance/Stuck Off
- Opel Astra • 2004-2023
Confirm which automatic gearbox the car has before ordering a solenoid or fluid.
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