2001 Audi A6 Quattro Q&A

2001 Audi A6 Quattro Question: I recently had exhaust issues

I took the car to and muffler shop and had some pipes replaced. And the car drove in the shop but it would not drive out... they put my old o2 sensor back in but in the process they messed up the wires going to the sensor and the car will not turn over. I asked around and some ppl said it could have fried my ecu. Any help would be nice.. thx -
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