Q: Q: Transmission problem

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I have a 2003 Nissan Sentra - Auto Transmission - with about 95,000 miles. Recently it has been having trouble shifting into higher gears (like it is stuck in first gear). When I turn off the car and turn it back on the problem is fixed for the rest of the trip (usually). Also, the "check engine soon" light is on and we have already tried replacing the speed sensor, my mechanic said that could be an electrical problem but he cant find, Is there anything else we can try other than replacing the transmission? This our mechanic's final suggestion.

My car has 95000 miles.
My car has an automatic transmission.

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