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Old 06-25-2007, 09:40 AM
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Join Date: Jun 2007
Posts: 2
Check Engine Light Codes P0432/P0422 ?

On my 2001 E320 AWD wagon [94K] I'm getting these 2 codes only:

P0422 - Main Catalyst Efficiency Below Threshold (Bank 1)
P0432 Main Catalyst Efficiency Below Threshold (Bank 2)

I've cleared the codes often and within 15 restarts they reappear again with the CEL staying on till I clear it again.

Work recently done:
new battery
new Bosch spark plugs +2
New air filter
Cleaning of the MAF with CNC cleaner
High test gas only

Wagon runs strong with no hesitation at all but the CEL reappears with the same messages:

Help with any suggestions at this time!

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Old 06-25-2007, 09:43 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Not good codes to get!!! very $$$..

Emission warranty covers them for 8yr/80K miles. are you BELOW that mileage?
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Old 06-25-2007, 11:22 AM
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Join Date: Jun 2007
Posts: 2
Milage is at 94K--out of warranty---could it be forward oxygen sensors the problem--there's no noise coming from the cats--anything else to check---LMK--thanks

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