All these are causes of catalytic converter failure EXCEPT ...

[lb_gilbert]

Question 1

A P0422 (catalytic converter efficiency failure) is set. What is a possible cause?
◦ Engine mechanical fault
◦ Exhaust leak
◦ Fuel contamination
◦ Any of these

Question 2

All these are causes of catalytic converter failure EXCEPT ________.
◦ Contamination
◦ Excessive temperature
◦ Incorrect air/ fuel mixture
◦ All of these are causes of converter failure.

[lou]

Answer 1

Any of these

Answer 2

All of these are causes of converter failure.

[lb_gilbert]

Thanks for the timely response, appreciate it

[nguyenhoanhat]

Great answer, keep it coming