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The easiest way is to disconnect the battery for about five minutes. This will reset the computer and clear any codes. Once you connect the battery you need to take the car out for a drive and let the computer relearn your driving habits. It you have something wrong with the car the check engine light will come on again. You will need to get the error code and fix the problem for the light to stay off permanently. Most car parts places will check your computer for error codes free.
Usually this is a bit of dirt in the engine plugging the oil port that supplies pressure to the variable valve timing control cam. Change your engine oil every 3000 miles and maybe switch brands. I had this problem on my Matrix until I switched to Castrol GTX 5W30 that cleaned the oil port right out.
The battery light comes on if the battery voltage is too low. Check you battery voltage. It should be above 12V with the engine running. If not, the alternator is not working. Next, check if there is power on the FIELD terminal of the alternator. Again, you should have 12+V. Check if the Alternator fuse is blown.
need the code number that was set on your computer when the check engine light came on. Autozone'll tell you the number. Often the code is self explanatory.
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