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Normally when you replace the battery you disconnnect the computer and it should clear any codes stored. (The codes are what turn the check engine light on.) More than likely the cause of the light coming on is due to a vacuum line that was pulled loose when installing the battery. I had the same thing happen and it was caused by a vacuum line going to the cruise control. As soon as the line was reconnnected the light went off. You may want to have the codes checked by a reliable source such as Car Quest or any good mechanic if you can not find the problem. Autozone does the code check for free!

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โˆ™ 2008-04-14 21:41:58
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Q: Could replacing the battery on a 2001 Mercury Sable make the check engine light stay on?
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