Question about 2002 Volkswagen Passat
P0431 Warm Up Catalyst Efficiency Below Threshold Bank 2
The word Catalyst, means that the catalytic converter needs to be replaced because some of the warm up catalyst is not working initially when the car first starts up before it warms up.
Good luck on this repair.
Posted on Nov 12, 2010
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Posted on Jan 02, 2017
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