Where is the O2 Sensor on 88 300E please??
 

Anyone know where this sucker is? And maybe a description of what it looks like?? Forever in debt, as always....;)

Probably
 

In the same place as on the 86. Down at the bottom of the exhaust pipes just before the center muffler. It sits in the dual pipes where they come together and it faces upward and is surrounded by a small sheet metal protector. You can disconnect the three wires attached in the car on the passenger side, under the carpet and pads on the tunnel close to the left front edge of the passenger seat, but down close to the floor. Unplug it there, then pull the wires out through the hole. Then I suspect with a good wrench and a cheater bar you will be able to wrench it out.

should be 1 before the cat and 1 after

Not on an 88 model - not until much later.

thank you very much!!!!

Car in question is not OBD2.

Yeah I was mindset of the newer cars because that what ive been working on a lot lately.

That explains it..................:)