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Originally Posted by tiv0
ive heard them mentioned many times, but what exactly are codes? and where are they stored?
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See the "how to" documents under "engine." Engine control unit codes usually illuminate the CHECK ENGINE light to alert you to some aspect of engine performance or monitoring that's gone out of bounds, usually a faulty sensor or the like. Check the codes to pinpoint the trouble.
Agree that tracking fuel costs and consumption is rather depressing these days, but I figure one of the surest signs of a contented engine is consistent fuel economy.
dcb