I just bought a compatible O2 sensor for my car (BOSCH one, identical to the one I've got on the car but with a different electrical plug because it belongs to a different car model), I am going to re-wire it to put on it the original MB connector.

It's a 3 wires: 2 whites and one black.

I am assuming the 2 whites are for the heater, so without polarity and the black one for the signal?

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From 300CE to SLK230K

I wondered the same thing when I swapped mine. I simply hooked it up the same way as the existing sensor.

Jeff Pierce

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Jeff Pierce

Current Vehicles:
'92 Mercedes 190E/2.3 (247K miles/my daily driver)
'93 Volvo 940 Turbo Wagon (263K miles/a family truckster with spunk)
'99 Kawasaki Concours
Gravely 8120
Previous Vehicles:
'85 Jeep CJ-7 w/ Fisher plow (226K miles)'93 Volvo 940 Turbo Wagon
'53 Willys-Overland Pickup
'85 Honda 750F Interceptor
'93 Nissan Quest
'89 Toyota Camry Wagon
'89 Dodge Raider
'81 Honda CB 750F Super Sport
'88 Toyota Celica
'95 Toyota Tacoma
'74 Honda CB 550F

There is NO polarity on the heating element.

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2007 C 230 Sport.