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1999 Audi A4 Check Engine Light


I drive a 99 Audi A4 with about 83,000 miles on it. I have been driving it with no problems since I got an oil change two months ago. This morning, I drove it 15 miles to work, stopped 1 block from work to fill it with the same gas I always get, and immediately after I turned the car back on again the check engine light came on. I only had to drive it one block to get to work, but I’m wondering if this sounds like it could be some sort of fluke. I also have a 2004 Honda, and if the gas cap isn’t secure I’ve been told it could lead to the check engine light. Is there truth to this rumor, and if so, does it apply to Audis as well? Any guidance would be appreciated. Thanks for your help!

True that the gas cap can cause a check engine light as can overfilling the tank . Try tightening the cap till it clicks three times and as long as the car runs normally drive it . It may take three or four driving cycles for the light to clear .

Fuel cap is one of many reasons to trigger your Check Engine Light(CEL). Tighten and drive a few more times it may go out.

If the light remains lit after a bit you need to take it somewhere and get the codes read and a diagonsis. You typically get charged for this.

A solid CEL means no urgency but get it looked at soon. A flashing CEL means pull over/get towed or limp a mile or two to shop.

Good luck.

you can get the codes read for free at most auot parts chain stores.

That CEL (check engine light) is just a kid in class waving her hand trying to get you attention because she has the answer. You need to have the codes read. Some places will read them for FREE. Try Autozone or Advanced Auto Parts. Get the exact code (like P0123) not just their translation into English and post it back here. Note: VW seems to come out with advanced computers and not all testers can read the VW error codes.
You may need to find a VW shop to get the codes read, or maybe not.