2001 Audi A4 2.8L ATQ CAT converter error code
My check engine light has been ON for a while now and the following error codes pop out: P0420 and P0430. They relate to cat efficiency on both bank 1 and bank 2.
My mechanic originally suggested that I change the the cat converter. After dropping it off at the shop, he called me with information about a TSB regarding an update ECM for False Cat Converter DTCs (# 2010066/2).
A couple of questions:
1. Does the TSB apply to my car? How do I figure out the VIN range that the update is pertinent to?
2. I have to go to the audi dealership for the update and they charge ~$200. Is this going to work or is it a red herring?
3. A little while ago at another garage, the mechanic showed me the read out of the 2 oxygen sensors. His comment was that the oxygen concentration at both sensors were very close to each other and this implied that the CAT was poisoned. Does this make sense?