Well ever since I got my car I've only had a problem with the light under one circumstance. I take this one highway thats 55mph, or any place thats 55mph it comes on.
I'll be doing 70-72 on the thruway and it never comes on.

Any reason why it does that?
I know the engine isnt bad because ive had it since october and no engine problems.

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1993 Audi 90

Get the code scanned & post it. With out knowing the code it could be anything.

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01 A4 1.8TQ AT-APR Stage1 & Snub Mount-HyperBoost DV-K & N Air Filter-STI Coils-NGK Plugs-N75 J Valve-Borla Catback-ASA AR1 18x8s w/Yokohama AVID W4S 225/40/18-H & R Coilovers-Eclipse AVN 6600 & Hifonics Zeus-Depo F/L Headlights w/HIDs-Smoked Side Markers-RS4 Grille