Mr Benz,
If you are going to work on your car yourself, you will need a manual to help. We offer the CD's for the 201 on partsshop to the left of this screen.
It will have the sensors and locations in there.

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM