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
Transmission hard shift when check engine light comes on on 2003 Saturn L300
by saturnL300rocks in Springville, UT on January 12, 2012
ANSWER by ramp dog , January 12, 2012
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.