Audi A4 engine warning light - what does it mean?

I'm looking to buy a 2006 Audi A4. The engine warning light remains on when started but the car drives fine. What could this issue be? Emissions and/or Cat problem only? Or something more costly?

Asked on 24 October 2016 by Lee Tyler

Answered by Honest John
Could be a lot of things. Might be that the immobiliser is disconnected. Might be an issue. The most obvious advice is to ignore this car and find another one.
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