Where is the O2 Sensor located on my 1988 190E 2.3?

Chris Prestridge

Your O2 sensor is under your vehicle,located
center of car close by your shifter knob.
It has three wires (O2 sensor) ,
O2 sensor wire connector is located under right front floor mats close by front seat.
to remove O2 sensor you need 22mm open wrench
have fun :)

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MB STARS Master Guild Technician,12 years MB tech
5 years independent shop owner