BMW E39 TRANSMISSION IN LIMP MODE AND P0720 ERROR

Question

OBD ERROR 2001 BMW 530I P0720 CHECK ENGINE LIGHT AND AUTOMATIC TRANSMISSION LIGHT ON LIMP MODE EMERGENCY MODE TRANSMISSION DRIVES ONLY IN 5 GEAR O 4 I THINK ITS IN LIMP MODE TRIED TO RESET MY PUTTING KEY IN POSITION 1 AND PRESS GAS PEDAL IT WORKED FOR A WHILE BUT PROBLEM APPEARED AGAIN ALSO THAT DAY I WAS CLEANING TRANSMISSION AND ENGINE ON THE BOTTOM WITH BRAKE CLEANER ALSO I HAVE OIL LEAK FROM RADIATOR PROBABLY TRANSMISSION OIL COOLER . WHAT TO DO ? HOW TO RESET TRANSMISSION DISCONNECT BATTERY ?

Answer 1

P0720 Output speed sensor circuit malfunction

If the output speed sensor or even the turbine speed sensor fails , you go into limp mode, disconnecting the battery will do nothing , inorder to shift gear the DME needs to know the speed of the output for gear change. to replace the output speed sensor you will need to remove the transmission pan.