The efficiency of the catalytic converter for cylinders 1-3 is insufficient. (P0422)

The efficiency of the catalytic converter for cylinders 1-3 is insufficient. (P0422)

Test 1: Test efficiency of catalytic converter for cylinders 1-3.

1. Test efficiency of catalytic converter for cylinders 1-3.
Possible cause and remedy

- Catalytic converter for cylinders 1-3
End of test