Signal Too High/Signal Too Low

Signal too high / Signal too low

Checking components
Check the exhaust system for air leakage

Hint: If the above fault-tracing does not remedy the fault, try replacing the heated oxygen sensors (HO2S), as the diagnostic trouble code (DTC) can also be stored by a damaged front/rear heated oxygen sensor (HO2S).

Remedy as necessary.

Other information
- Checking for air leakage in the exhaust system Air Leakage Exhaust System, Check
- Heated oxygen sensor (HO2S), replacing Heated Oxygen Sensor (HO2S), Replacing
- Checking wiring and terminals Checking Wiring And Terminals






Continue - Verification

-------------------------------------------------

Verification




Verification

Verification

Hint: After carrying out the repair, check that the fault has been remedied.




- Ignition off
- Reconnect the connectors, reinstall components etc.
- Test drive the car at an even speed (engine speed (RPM) above 2000 rpm) for at least 10 minutes
- Release the accelerator pedal (AP) quickly at least three times to simulate fuel shut-off
- 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 out the deviation between the front and rear heated oxygen sensor (HO2S).
Check that the value is between -0.03 and +0.03.





Is the value OK?

Yes - VERIFIED

No - VERIFICATION FAILED

------------------------

VERIFICATION FAILED - Fault-tracing information

VERIFIED - Fault Found

-------------------------------------------------

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 - FAULT-TRACING FAILED

No - Attempt New Test

------------------------

FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking components

-------------------------------------------------