Error codes and their meaning

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Error codes and their meaning

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Mercedes Forum >> Mercedes Benz Models >> Mercedes M Class >> Error codes and their meaning

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Error codes and their meaning - 8/6/2008 10:15:50 PM

bballfreak

Posts: 14
Joined: 7/23/2004
Status: offline

I have a 2000 ML55 and had a check engine light.
I have a OBDII code reader and it shows the following codes
P0422 and P0432.
As per the MB code,
P0422 Main Catalyst Efficiency Below Threshold (Bank 1)
P0432 Main Catalyst Efficiency Below Threshold (Bank 2)
what does this mean?
any help would be appreciated.
Thanks