engine code

[jensen1]

I pulkled a code of PO422. Can anybody tell me what this is and what things should I ckeck.

Thanks

[veedubmechanic]

Cat bank one efficiency below threshold.

WHat engine? year??

Check for bad coil pack arcing they can cause this code.
If your cat is rattling then its time to replace it. vw has the 8yr 80k emissions warranty on cats.