Quote:
Originally Posted by jimp024
I have a 2001 ML320 that is showing a PO422 code on the OBD2 scanner. That says Main Catalyst efficiency below threshold (bank 1). It sounds like there is a minor exhaust leak when its warming up, does this code mean I have a bad CAT or could it be a cracked weld in the system. Also is bank 1 the drivers side or passenger side of the car. Thanks for any info.
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Bank one is the passenger side.
The W163 is well known for cracks in the catalytic converter, so that's possibly what's going on. Have it checked, as you know carbon monoxide is poison and it could leak into the passenger compartment.
MB cats from the late 90s to the mid 2000s are also known for failing; rattles, meltdowns, etc. That can obviously create problems, too.