Action in service

After this fault, an active test is automatically activated (secondary fault in fault memory!).

1. Read out result of active test (Are there other faults in the fault memory? => Then continue there!)
2. Run system test Swapped exhaust gas oxygen sensors Follow instruction for system test.
3. If system test shows no result, then
4. Visual inspection of wiring and connectors
5. Test the wiring
6. Replace lines or connectors if necessary
7. Check exhaust system for tightness before post-catalyst sensor
8. Replace downstream catalytic converter of exhaust gas sensor
9. Replace primary catalytic converter of exhaust gas sensor
10. Replace control unit