Replaced Oxygen Sensor, Light Still On!
 

My 1984 190E with the 2.3 engine is now on the road! It had several lamps out on the instrument cluster, so I pulled it out and replaced them. The O2 light was MISSING, so I replaced it, along with the others. Now it burns steady. I bought and installed a new O2 sensor. While I did it, I disconnected the neg battery terminal. Well, I reconnected everything, and the light is still on. Any reset info that I am not getting?

Also, the car wants to idle really slowly, and tries to die when I put it in gear (automatic) Other than this, it is doing very well.

Thanks for reading this!

Bruce

pulling the bulb is the way to turn it off, the relay does have a rest button on top, but usually never works. if you want to try to reset it, it is under the passenger foot rest area

Then, I need to pull back the carpet on the passenger side? Or under the side area?
Thanks for the tip!

I ran the car on a mountain road this afternoon. No traffic. It pulls pretty good for a 4 cylinder. The more I drive it, the better I like it.

Bruce

ON that year & model the BULB was designed to be removed at 60K miles.

At that service the sensor was to be replaced as a service item!

The speedo has a 1 time device to turn that lamp on!

So, I just basically wasted $70 on a universal O2 sensor! D**n It!

Thanks for the heads-up. I thought I was doing the right thing.

I believed the owners manual.

I could have wasted the $70 on other things that this car needs!!!

Bruce

As DOC said, the fix was to pull the bulb from the instrument cluster socket. I suppose an alternative would be to put black electrical tape over the sensor light window on the right side of the cluster.

That system, using the odometer to trip a switch, was used through 1986. The W201 service manual would have indicated that.

I believe that the 1987 and newer models went to the reset light via the relay located under the front passenger seat carpet.

Thanks for the replies on this. I should have asked here FIRST before I replaced the sensor anyway. On my American cars, theres never been an issue like this that I recall.

I get to pull the cluster again anyway. Besides pulling the bulb out, I get to clean the insides of the cluster, and see what is broken on the speedo section that drives the odometer. With a little luck (!) something has just popped out of place!

I'm looking into getting a service manual. HOWEVER, all I have found is a CD-ROM of the manual. Id really rather have something on paper, but if I have to, I will get the ROM version.

Thanks for the help. This is all a learning experience for me.

Bruce :freak:

i don't think it was a waste of money replacing the 02 sensor..you are good for another 60-80k miles..

I guess it isn't a waste of money... I guess it will help the thing run better...

I went ahead and bought the CD ROM from one of this sites sponsors today. I cant wait to get it.

Bruce