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i own a 99 323i with about 92,000 miles recently my check engine light came on ,but the car showed no problems at all, i took to auto zone they hooked up their reader and said the light was coming from my ignition system,and if i have no problems i probably should just have a tune up,so first thing i did was change the spark plugs, and the light went out,but since then it comes on for a liitle then goes off for a little, very wierd, any help will do!!!!!Thanks Duane
 

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my check engine light has come on twice. One time it was because the Oil cap was on tight enough and the other was because the gas cap wasnt on tight enough.

The check engine light is rarely for mechanical problems on a bmw. it's typically letting you know something is on right.
 
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