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Thanks in advance for any help on this "ghost" of a problem. I recently purchased a 1999 Audi A4 Quattro 1.8 Automatic. The wife picked up the car, and it died on the way home. Not thinking it was anything more than a sensor, we trailered it home. I also have a '98 A4, identical, except it's a manual trans. Thinking it was a sensor problem, as the injectors are pumping gas like crazy, I swapped out MAS air sensor, and coolant temp sensor, and ambiant air sensor with the ones on my car. ( all same part # ) To no avail. To make a long story a little shorter, we have swapped over every sensor, or disconnected the ones that were not neccesary for the car to run. ( even the ECM ) My 98 runs with the 99 sensors and ECM installed. The 99 STILL dumps fuel like mad. We picked up a scanner, and tested BOTH cars with the components back on the original vehicles. My 98 showed a few sensors not reading.. and a couple old fault codes. My wifes 99 showed the "comp"= ok, and ALL other sensors N/A. I switched ECM again, and my ECM in her car did the same thing. Her ECM in my 98, showed all the sensors as "ok". I also noticed that the dash cluster on her 99 has all the fault lights lit up when I turn the key on. Somehow the ECM in the wifes 99 cant "see" the sensors on the car, resulting in an obscene amout of fuel. I also swapped any of the relays under the dash in hopes that there was a faulty fuel pump relay, ignition relay, or ECM relay... again to no avail. Also read somewhere that a faulty abs sensor could cause communication problems. Disconnected the abs sensor.. again no change. any direction would be most appreciated !!