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Q: Transmission hard shift when check engine light comes on on 2003 Saturn L300

I have a check engine light that won't go off and I have the battery disconnected hoping to reset the computer. I replaced the MAF sensor last night. However I also have had the transmission shift hard at times when the check engine came on. There was an post about this exact thing that wasn't answered and I wanted to know if you could help. Thanks
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I don't believe the check engine light has anything to do with trans shift, the light could be a number of things ie o2 sensor or catallitic converter or many other sensors. take to shop and have them run a code check first.
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