Lamda sensor W124 230TE

[spud murphy]

Hi all, the old bus failed the emissions test the other day and that coupled with a rattly 'cat' and ropey downpipe has prompted an exhaust change. Was looking to replace the lambda sensor as well and back tracked the lambda sensor wiring plug to under the drivers seat.
Trouble was this was all corroded and full of green bloom and disintegrated when touched....... hmm must have been damp for a period in its life.

Got all the new bits but am at a loss as to wheather the lambda sensor has to be wired in any special orientation. The car side wires are brown and black with a red stripe whereas the sensor wires are both white and and look like high temp silicone insulation.

Any help much appreciated, thanks all

 

[GEORGEROV]

Hi Spud, I thought the 124's were 3 wire lambda sensors, ie 2 for the heater and the third wire for the sensor, but if it is only a 2 wire sensor then one wire will be for the sensor voltage and the other an earth wire. Use an ohmmeter and see if one of the wires is connected to the body of the sensor (the screw thread ) and if so this is the earth connected wire. You will need to check the car side wires to see which colour goes back to the ecu for the sensor input.

 

[spud murphy]

Cheers George, you were right, there was that much crud and undeseal it was hard to see.