Where is the Engine Control Unit (ECU) located in a 1999 Audi A6 Quattro?
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1999 Audi A6 Quattro Question: Engine Control Unit (ECU) location?
Answer #1raiderron September 12, 2011, 20:34Master
I believe it is still under the carpet and cover under the passenger side front seat.
Answer #2patrick mannion from Greg Solow's Engine Room, September 12, 2011, 21:13Master
Engine ECU is just under windscreen in the engine compartment on the passenger side.