Signal Too High/Signal Too Low/Signal Missing

Signal too high/Signal too low/Signal missing

Checking the components and wiring

Caution! Do not apply rust solvent spray or grease to the heated oxygen sensor (HO2S) connector.

Check the exhaust system for air leakage.
If no fault is discovered, try using a new rear heated oxygen sensor (HO2S), as a damaged rear heated oxygen sensor (HO2S) can cause a diagnostic trouble code (DTC) to be stored.
Remedy as necessary

Other information
- Air leakage exhaust system, check Air Leakage Exhaust System, Check
- Oxygen sensor (Catalyst monitor sensor), B5254T7 Service and Repair





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 components and wiring

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