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But don't throw your wallet in the street just yet. There are also plenty of little things that can make the Check Engine light come on, and many are easily corrected. Here are a few of the more commonly occurring issues:

Your gas cap isn't on tight enough.
You read that right, it might be your gas cap. Some cars measure how much pressure is building up inside your gas tank. It involves a series of mathematical algorithms that track your driving style and how much pressure is usually in the tank, then set off an alarm if it strays a certain percentage from the average. Whatever. All is means is that if you're gas cap isn't on tight, it thinks something is up and lights the orange dashboard candle, the Check Engine light. Tighten the gas cap and see what happens. It may take a week or more before the light goes out.Your engine got wet where it didn't like it
Any electrical burp under the hood can cause one of your car's gazillion sensors to take a funny reading. When it does, you can expect to see the Check Engine light. We worked on a Ford truck once that triggered the Check Engine light every time it rained. After a lot of diagnosis, we found water that was dripping onto a spark plug wire, then running down the wire to the engine's head, causing an occasional short. Every time the water ran down the wire, the light came on. A few days later, it would turn off on its own. Be sure your engine doesn't have a wetness problem. More common than rain water getting in there is the overzealous owner who sprays his engine down at the high pressure car wash, shooting water into every crevice of the engine, thus lighting the light.

Your spark plug wires are bad
As your spark plug wires start to get old, they may develop tiny cracks which can let little bursts of electricity out. This electricity was supposed to be going to a spark plug, and since it didn't, the engine will misfire slightly, meaning one of the spark plugs didn't spark enough. Once again, this can cause the Check Engine light to come on. With your engine off, check your spark plug wires for tiny cracks or holes, especially around the ends of the wires. If they look shabby, you should replace them.

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Audi A4-Quality
As with all Audi product recently the quality is high and the finish superlative.

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Tips:
It's always a good idea to have a map of the area where you're traveling--getting lost is not good for fuel economy.
Ask your innkeeper, hotel desk manager or other "local" to advise you on best routes. The shortest distance may not always be the best choice.
Consider leaving the car at home! Take a bus, train or ferry to your travel destination.



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