Question about 2000 Audi A4

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My audi a4 2.0 Alt engine does not start and the electrician said the computer box diagnosis indicate that all the sensors in a car do not work, but there is no messages displayed on the screen in a car.Is it possible that the problem is the computer box.How can I know when the computer box is damaged.

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Try and swap it out, try and find someone with the same car, make sure the transmission is the same. with your year car i believe only the 2000 and 2001 can swap. It sounds like the ECM is bad though.

Posted on Mar 30, 2011


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Sorry to hear that, $1700. is a lot. You may be close to having it fixed, though. At least you know the PCM is good.
There's still a problem with the speed sensor. I wouldn't call it a shorting problem, I don't think. But the sensor is critical for many operating components.
Level one diagnosis-if that means the short scan and diagnosis, not a full engine running scan, then go back and get the complete procedure. Some systems store speed sensor codes in the ABS(don't know if yours does, but check). Also see if your transmission has a computer to be scanned.
The alternator did start your problems. The mechanic sounds competent. I'd say you need more diagnosing.

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The temperature sensor is usually located where coolant flows through like around the thermostat housing. It would have two wires. To check it, unplug the wire connector while the engine is cold. (Makes sure the ignition key is off or it would throw a code).Use a multimeter to measure it's resistance. On a cold engine it should be a few thousand ohms. Now plug it back then start the engine. Let the engine warm to normal operating temp. Turn the engine off then measure the resistance again. You should get a much different reading this time (usually a few hundred ohms). If not then the sensor is bad. Also check if the wires are bad make sure there is no looses or damaged connection. The only time computer develop problem is due to mechanic mistakes by improper testing procedure. Other than that computers are very reliable. Also computer can develop problem by improper way of boosting a dead battery. The proper way should be to start the car doing the boosting, connect the cables then let the car with the dead battery charge a few minutes before cranking it.

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