P38 diesel 1997 when cold changes gear perfect but as soon as the engine reaches working temp it drops down a gear, the engine needs to reach 3500 rpm aprox to change through any of the gear, oil and oil cooler plus filter changed but bidnt help, I'm thinking sensor or solenoid , anyone got...

Hi out there congratulations on this superb sit, Im a new member and would appreciate any advice , the problem is P38 BMW left standing for 2 week when I tried the remote nothing happened so gained access with key in drivers door, battery totally flat, fitted new battery, when I tried to enter...