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Q: where is ecu/ecm located? on 2001 Audi A6 Quattro

My check engine light, abs,and air bag light is on. I recently had o2 sensors replaced and now the car is running very poorly. There is little acceleration, misfires, and just a terrible sounding engine. i took it to a foreign car specialist who said that the computer is shorted out and needs to be replaced. I need to find out where it is located so that I can get the part number to try to find a used or remanufactured one myself. where is the computer on a 2001 a6 quattro wagon?
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ECM Part# 3B0907551BQ MSRP: $1350.00
If you post an e-mail I can send you a diagram of the control module location.
Anyway if you replace the ECM it needs to be programmed and coded to the car with an OE diagnostic computer, otherwise it won't start. It applies to a used ECM also.

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