Lower Limit

Lower limit

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

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
- Signal specification, B5254T7 Signal Specification
- Fuel system pressure, checking, B5254T7 Fuel System Pressure, Checking
- Mass air flow (MAF) sensor, B5254T7 Service and Repair





Continue - Verification

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Verification




Verification
Read out and note the adaptation value.

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 is approaching 0 compared with the noted value. Check that the adaptation value is within the range 0 ±10 %.





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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