2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 807

Lambda control, before TWC left (P0173)

Possible cause:

- Lambda control

Affected functions:

- Engine output

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Test 1: Check self-adaptation.

1. Check self-adaptation.

Test 1.1: Check lambda control.

1.1. Check lambda control.

Test 1.1.1: Check seal of component B2/5 (Hot film mass air flow sensor) with air filter for cracks.

Test 1.1.2: Inspect air cleaner housing.

Test 1.1.3: Check component G3/3 (Left O2 sensor, before TWC [KAT]).

Test 1.1.4: Check component Y62 (Fuel injectors).

Test 1.1.5: Check exhaust system for leaks.

Test 1.1.6: Check signal from component B2/5 (Hot film mass air flow sensor) via actual value.

1.1.1. Check seal of component B2/5 (Hot film mass air flow sensor) with air filter for cracks.

Possible cause and remedy

- Check seal of component B2/5 (Hot film mass air flow sensor) with air filter for cracks.

Note

- Proper sealing between the air cleaner housing and the housing of the HFM mass air flow sensor must be assured.

End of test

1.1.2. Inspect air cleaner housing.

Possible cause and remedy

- Inspect air cleaner housing for correct installation.