Upper Limit

Upper limit

Checking components
Check the exhaust system for air leakage.
Check for too low fuel pressure.

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

Remedy as necessary.

Other information
- Air leakage exhaust system, check Air Leakage Exhaust System, Check
- Fuel system pressure, checking, B5254T7 Fuel System Pressure, Checking
- Oxygen sensor (Catalyst monitor sensor), B5254T7 Oxygen Sensor (Catalyst Monitor Sensor)





Continue - Verification

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Verification




Verification
Read out and note the adaptation value for the vehicle.

Note! Do not erase diagnostic trouble codes (DTCs) as this also resets the adaptation values!

Test drive the car and perform a TRIP schedule.
Verifying repairs Verifying Repairs
Read off the fuel trim.
Check that the adaptation value has approached 1 compared with the noted value.
Check that the adaptation value is between 0.9 and 1.1.





Is the value OK?

Yes - Troubleshooting procedure complete

No - 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 components

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