My pathfinder failed an emmisions test with the following codes:
p0420 - Catalyst System efficiency below threshold (Bank 1)
p0430 - Catalyst System efficiency below threshold (Bank 2)
I believe this might be referring to oxygen sensors but dont know for sure. If it is is there anyway from the above code to know which ones need replacing. I think my vehicle has (4) 2 upstream which are under the engine which I can see and I believe 2 downstream on the outflow of the exhaust system. These are expensive enough anyway and only want to replace the necessary ones. Also I had a friend tell me not to replace them but to clean them with brake cleaner and they would be fine. Is this true or would that be a waste of time.
have the same problem?
Monday, January 16th, 2006 AT 2:07 PM