2001 Audi S4 Q&A

2001 Audi S4 Question: my engine lite came on today. WHY? my air bag light has been on for the last yrs

three weeks ago, my timing belt,water pump,passenger side valve cover gasket and my alternator was changed. On Wednesday the dealer will be replacing my driver side valve cover gasket and repair my passenger side CV joint. Mileage on car 50,000 miles. -
Answer 1
scan test for codes -