how to change Oxygen Sensor

Located on the cat... in the front... you got two cat if original... the O2 sensor would be located in the front cat... you will see that one wire connected to the O2 sensor.

I have given some more thought on your problem... fuel economy so bad... and difficult starting... I think your fuel mixture is too rich.

You should be getting 17 MPG..

Hey Tiger... You happen to know where the 02 Sensor is on my 89 300E? Im having the same problem he is having on his 380. -Thanks- Chuck

On the W124, it's in the same place, on the exhaust system, after the exhaust manifold, but before the catalytic convertor. On the passenger side of the car, just about under where the passenger seat is, you'll clearly see the cable that goes from the exhaust pipe into the cabin floor. Inside the car, lift the carpet and pad near the center console tunnel and you'll see the rubber gromet that the wire enters. The three wire plug is on the inside. Unbolting the sensor is a "knuckle buster" given the tight fit and typical corrosion around the sensor.

Don't forget, that on the W124/W201, the Bosch sensor from the Ford Mustang

5.0L V-8 is the same part (you will have to solder on the old plug) for about 1/3 the price of the Bosch part for Mercedes.

I always buy generic O2 sensor... and just splice the wire... tons cheaper and there is absolutely no need to buy OEM harness type O2 sensor.

"Tiger" wrote in news:%cRTc.4009$ snipped-for-privacy@news4.srv.hcvlny.cv.net:

As long as it's not a Wideband sensor (0-4v I think ) you'd be fine.

The 0-1v sensors are pretty much all the same, as far as I have been told; there will only be slight differences from model to model and manufacturer to manufacturer which are probably less than the manfacturing tolerances.

Depending on whether there is a heater on the sensor there will be 1-4 wires - the heated ones will get up to operating temperature faster.

S.