P1145
P1145Oxygen Sensor Ahead of TWC, Bank 1 - Above Limit
Diagnosis conditions
- Exhaust temperature between 250 °C and 750 °C
- Battery positive voltage between 10 V and 16 V
- All 4 oxygen sensors ready for operation
- Travel, partially loaded, for approx. 20 minutes
Possible fault cause
- Electrical fault in the inlet camshaft adjustment device
- Leaking exhaust system
- Oxygen sensor ahead of catalytic converter faulty
- Mechanical fault in valve drive
Affected terminals
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Diagnosis/troubleshooting
NOTE: Do not use contact spray on the oxygen sensor plug connections, as this may cause irreparable damage to the wiring (blocking the reference air channels).
NOTE: Do not confuse oxygen sensor ahead of catalytic converter and oxygen sensor after catalytic converter as this will cause implausible fault entries.
Distinguishing feature of both sensors:
Oxygen sensor ahead of catalytic converter (LSU) has a 6-pole connector
Oxygen sensor after catalytic converter (LSF) has a 4-pole connector
