Hi all,

I'm a new member, still learning still reading the great wealth of information on this forum and the associated pages.

I have a 2000 A6, with a 4.2L auto engine. Here's the situation that has brought me here:

A couple years ago the pass side cat went bad, and I replaced it with a OEM fit cat purchased online. Everything is great, the car passes emissions with no problems EXCEPT every few days I get P0422 cat below efficiency code that I have to clear and after many hours of research and reading online, the problem is the cat is a good cat, it just doesn't clean the exhaust to the standards set by the ECU that were artificially elevated from the factory.
There is a Techinal Service Bulletin for my model that reflashes the ECU to correct this and lower the efficiency standards but every dealer I have called about having it done is telling me it's gonna be a minimum of 2 hours labor to search and do the flash, which around here is more $ that I paid for the cat.

I've downloaded nefmoto and I have a blue ebay ODB cable and also have a VCDS cable, so if someone can help me with some guidance on how to read my ECU, change what needs to be changed so that I don't keep getting the P0422 code I would greatly appreciate it!

Thank you in advance.

You can read. The trick is to connect, attempt a read, allow it to fail, then reconnect. Try with 38k baud, and it should work the second time.

OP: memory layout is 29F800BB.

This is your original file.

BTW-saw the car on ebay. Love whitel