Lower Limit

Lower limit

Checking components
Check the intake system for air leakage
Check the fuel and residual pressure. Check for high fuel pressure. Check for leaking injectors.
Check the mass air flow (MAF) sensor. Read off its correction factor. The value must be between 0.8 and 1.2.
Check the engine oil visually for contaminants.
Check that the oil level is between the minimum and maximum markings on the dipstick.

Note! There must not be any air leakage when this test is carried out.

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 leaks in the intake system, checking Air Leaks In the Intake System, Checking
- Fuel system pressure, checking, B5254T7 Fuel System Pressure, Checking
- Mass air flow (MAF) sensor, B5254T7 Service and Repair
- Oxygen sensor (Catalyst monitor sensor), B5254T7 Service and Repair





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 - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

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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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