Faulty Signal
Faulty signal
Checking the connector
Check the connector for the rear heated oxygen sensor (HO2S). Check for contact resistance and oxidation. Remedy if necessary.
Try a new heated oxygen sensor (HO2S) if the above fault-tracing does not remedy the fault.
Other information
- Oxygen sensor (Catalyst monitor sensor), B5254T7 Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals
Continue - Verification
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reconnect the connectors, reinstall components etc.
- Start the engine. Allow the engine to idle for at least 1 minute
- Test drive the car at an even speed (approximately 80 km/h for at least 5 minutes)
- Connect VCT2000 to the data link connector (DLC) without switching off the engine.
Note! If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated.
Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list.
Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.
Is the function OK?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Checking the connector
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