Originally Posted by mdaniels4
FWIW, not talking about the tranny, I usually run 87 Octane fuel. No knock, no degradation in mileage or performance that I can tell at all, so fuel is the last thing I would be concerned with. Somewhere along the way, your car is merely in limp mode, and my bet would be the TCM.
Why would think this is TCM related? The code showing states input speed sensor:
(P0715) INPUT SENSOR MISMATCH . . . . . . . .21-90
(P0715) INPUT SENSOR OVERSPEED . . . . . . . .21-94
(P0715) N2 INPUT SPEED SENSOR
CIRCUIT. . . . . . . . . . . . . . . . . . . . . . . . . . . .21-97
(P0715) N3 INPUT SPEED SENSOR
CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . .21-103
Everything points speed sensor, I had the electric plate replaced (which included a new speed sensor)