A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

Check engine light

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Old 09-29-2007, 02:08 PM
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Default Check engine light

My check engine light just came on and I haven't noticed anything wrong. My car has about 78,000 miles. Does anyone know what could be wrong?
Old 09-29-2007, 02:59 PM
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Default Well, that could be anything........

get the codes read and find out what they are. You may not "notice" anything but there are many sensors that fail and the car will still run fine.
Old 09-29-2007, 03:30 PM
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Default after taking the info from your post... it's pretty clear what happened

check engine lights on these cars are usually caused by failure to relieve strain on nitrous lines before accelerating.

This is usually caused by not properly warming up the car, or letting it cool down. Your best bet for remeding this situation, is
1) go inside your car and put your key into accessory
2) pull your driver door handle twice and your passenger door handle once (from the inside)
3) pump the gas pedal 3 times in less then 4 seconds but not less then 2 seconds, ideally we are looking for a three second pedal pump
4) Start the car

this should have reset your check engine light...

these cars come stock with nitrous lines that are prone to failure... if you are still worried, search the forum archives. There is lots of information about failure on the nitrous lines, Or else the muffler bearings.. good luck!
Old 09-29-2007, 08:22 PM
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Default

You hit that nail right on the head..... It worked for me
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