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i started out with just my cold air intake then i went to apr and had stage 1 done on my 2007 a3 had it about three months no problems everything was great, i decided to buy the euro sport down pipe and that came with the magnaflow high flow cat i had that installed about three weeks and on my way to apr to have stage 2 installed for the down pipe my check engine light came on so the apr guy hooked it up to the computer and it said something about low threshold or something he said that it probably threw the code cause i didnt have the software installed for the downpipe. so he cleared the codes installed the new software and on my way home it came back on, has anyone had these types of problems b4 any input is much appreciated thanks alot guys
 

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You should have had him do the delete coding because it sounds like the sport cat is flowing to much gas through without the CAT cleaning it up so it's making the engine light come on (getting the same issue every now and then).

you could replace the lambor sensor but I suspect they are fine.
 
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