I have a 2015 Audi A3 2.0L Quattro. Bought the car CPO last year. About 3 months later, I had the steering rack replaced under warranty. about a week ago, my car stopped and shut off at a stop light. Had the car towed to Audi dealer. Dealer informed me the engine is dead (piston issue, no compression). I said Ok, is the CPO warranty going to cover it? Dealer said no, the car is flagged T23 (Same as TD1) because it has a tune on it. I said, not possible, because I didn't touch ECU. Dealer said the T23 code was picked up during steering rack replacement last year. So the question is, since the steering racks on these cars need to be married/coded/etc.. to the car, is there a chance that some part of this procedure made Audi's automatic detection that runs in the background think this is an ECU tune rather than an update due to steering rack replacement?