Question about 2001 Audi A4
The brake light issue isn't likely the the brake switch (since it sounds like your other brake lights are working properly). It's likely a bulb in the third brake light. When the filaments get old they sometimes lose and regain contact as the car vibrates on the road. Change the bilbs and see if the problem goes away. If it doesn't, look for a bad wire connection around the third brake light. Also, have someone verify the third brake light isn't working from the back of the car when you see the alert, it could be a bad sensor.
Posted on Jan 08, 2013
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Posted on Jan 02, 2017
Hi, the sensor on the engine (right at the rear end of the cylinder head) has two separate outputs. One drives the temperature gauge and the other provides data for the engine control unit. The output for the engine control unit is almost certainly faulty and the sensor will need to be replaced. It isn't an expensive item and's not time consuming to replace (1/2 hr) - so you could ask Audi to do it for you when they replace the ignition coils.
Hope that helps Matt..
Posted on Nov 23, 2009
I had an Audi A4, 10 years older than yours mind you, but it would start then stop, sometimes 10 times but would eventually go. I ran a little WD40 in the key barrel and put the key in and out a couple of dozen times. Wiping it with a cloth each time, lots of dirt came off. My theory and it's only mine, is that the wear on the key left dirty metal deposits inside which stopped the chip in the key being recognised. I believe they had a security chip inside the key.
Anyway after 6 months of this nuisance it never happened again after that. Fixed my problem and a lot of frustration. Maybe help you too.
Posted on Mar 03, 2010
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