14F500

The signal from oxygen sensor 1 (cylinder bank 1) is shifted towards 'Rich'.


Possible cause:

- G3/2 (Oxygen sensor upstream of catalytic converter)
Affected functions:

- Power generation

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Test 1: Check G3/2 (O2 sensor upstream of KAT) component for carbon fouling.

1. Check G3/2 (O2 sensor upstream of KAT) component for carbon fouling.
Check component G3/2 (O2 sensor upstream of KAT).
Possible cause and remedy

- Check G3/2 (O2 sensor upstream of KAT) component for carbon fouling.
Question

- Is component G3/2 (O2 sensor upstream of KAT) carbon-fouled?


YES
Component G3/2 (O2 sensor upstream of KAT) is carbon-fouled.Possible cause and remedy

- Clean component 'G3/2 (O2 sensor upstream of KAT)'.
End of test

NO
Check component G3/2 (O2 sensor upstream of KAT).
Possible cause and remedy

- Check whether the correct oxygen sensor is installed.
Question

- Is the correct oxygen sensor installed?


YES
Check line from control module N3/9 (CDI control unit) to component G3/2 (O2 sensor upstream of KAT).
Possible cause and remedy

- Check electrical lines and connectors between control unit N3/9 (CDI control unit) and component G3/2 (O2 sensor upstream of KAT) for loose contact and corrosion.
- Check electrical lines and connectors between control unit N3/9 (CDI control unit) and component G3/2 (O2 sensor upstream of KAT) for short and open circuit.
Question

- Are the electrical lines or connectors OK?


YES
The electrical lines or connectors are OK.Possible cause and remedy

- Replace component G3/2 (O2 sensor upstream of KAT).
- After replacing component G3/2 (O2 sensor upstream of KAT), the teach-in process for this component must be performed via menu 'Control unit adaptations'.
- Erase fault memory.
End of test

NO
The electrical lines or connectors are not OK.Possible cause and remedy

- Repair or, if necessary, replace damaged electrical lines and connectors between control unit N3/9 (CDI control unit) and component G3/2 (O2 sensor upstream of KAT).
End of test

NO
An incorrect oxygen sensor is installed.Possible cause and remedy

- Replace component G3/2 (O2 sensor upstream of KAT).
- After replacing component G3/2 (O2 sensor upstream of KAT), the teach-in process for this component must be performed via menu 'Control unit adaptations'.
- Erase fault memory.
End of test