It's not the sensor, you have a lamp out, find it and replace it, use the process of elimination, start with the parking lights, reverse lights, headlights, high beams, fog lights, brake lights and lastly turn signals, turn signal trigger keeps the light on until you reset the ignition key

__________________
Jerry

2004 SL500 Black 55K Miles
2002 s500 Black 90K Miles
1986 300E Gold 233K Miles
1966 Twin Cessna 320D
1989 Jeep Cherokee 233K Miles
1994 Ford Van E150 399K Miles