Error code P0420 - Catalyst system efficiency below threshold
#1
Keeper of the Cash
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Error code P0420 - Catalyst system efficiency below threshold
This code isn't from my car, but my neighbor's. Does this mean a bad catalytic converter?
#4
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Hmm
Probably needs a cat then. The reason I asked is that there is a TSB from Audi regarding engine control module reprogramming for the catalyst efficiency problem. But since its not an Audi, I have to say it needs a cat. I can also say that all cars sold in the US have an 8 year/80,000 mile emissions warranty mandated by the federal government, so as long as your friend is under 80K Ford should give him a new cat and install it for free too.
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