Benz Lover

Hello all,

Nice site by the way!!!

Today I went to get my emissions done and the dude told me to get a tune up and to replace my Oxygen sensor....now the tune up no problem...but where the heck is the sensor at?? does that really effect my emissions?

If some with knowledge knows please help.....

Also is it a hard job...my knowledege and experience is so-so, I have all the tools I hope....

Thanks

Oh by the way its a 1991 - 190e 2.6

aqua190

the oxygen sensor will definitely affect your emissions. it tells the computer how to change the air/fuel mixture. it's on the exhaust downpipe. you need to be under the car to change it. probably done best on a lift as they can be a bear to remove sometimes. if you change it yourself, make sure you don't get any anti-seize (usually supplied in a small tube with the sensor) on the end past the threads, it can ruin it.

Benz Lover

Is anybody out there?

Some one with more mechanx skillz then I

Benz Lover

Thnx....YOu know for some reason I cant locate a repair manual for this car...I have had it for like 2 years and finally i have just recently had issuses with it...I just replaced the Tranny and now thissensor....I believe that mine has some sort of metal thing around it...also should i just buy the "universal" or the oe part?

Also any other suggestions to make it pass?? I just did the spark plugs and oil and this week im gonna change the air filter ...... some one told me to adjust some hole on top of the air filter cover??? any ideas?
the dude told me to make something "leaner"


thanks

Dan's 1993 190E

I share your frustration with the service manuals. I searched for years before finally giving up and buying the CD-ROM. About 2 days after I got the CD-ROM, someone mentioned this site... it is basically all of the contents of almost all of the CD-ROMs.


http://mb.braingears.com/default.htm

dbenz

If you want to save money, buy an O2 sensor for a 1990 Ford Mustang 5.0L V8 (Bosch 13942). If your going to buy it from an auto parts store, they may try to sell you two. But you only need to buy one. You will need to splice the wires on the O2 sensor and match them up on the car. Then solder it.

SRDiver

sorry Dan

Benz Lover

Where did the Mustang idea come from??? Are the parts the same???

And say if i did this are the wires colored?

MTI

Bosch was the supplier to Ford, Mercedes, Volvo, BMW, and others and they also licensed their fuel injection system to various car makers. The Mustang sensor is identical to the Mercedes one (it even has metric threads), with one exception, the connector plug. Luckily, there's only 3 wires, one white and two black. The black are non-polarized since they are the heater wires for the sensor, which just leaves the white signal wire. With some insulating tubing, wire crimps and cutters, you should be able to rewire the sensor in about 4-10 minutes, depending on the number of beer breaks you take between wire splices.

SRDiver

Is that two blacks and a white for the Ford?
thought the MB one was two Whites and a black

MTI

My mistake, the Ford and MB sensor has two white, one black.

The connector in the cabin can be seen in the lower right part of the picture, being held down by the red handled pliers.

Benz Lover

Ok hold on now....the picture above is a manual correct??
Mine is Automatic.
Also I'm just getting the "OE" part that needs no re-wiring....when changing the part will I need to access the interior of the vehicle? Or is the plug in located under the car???

Thank you all for the info .

Peace
Jay

Pawsh

The O2 sensor's wiring connection is inside the vehicle. The wiring goes through a hole in the chassis tunnel. The wires then connect to existing plugs in the vehicle. Just lift the passenger's side floor carpet up, unplug the wires, and then push the wiring (and grommet) out through the hole in the chassis tunnel.

MTI

Yes, it doesn't matter if you have a slushbox or a clutch . . . the connector for the sensor goes thru a grommted hole near the driveline tunnel, with the sensor tapped into the exhaust pipe and the three wire connector inside the cabin under the passenger floor mat.

Benz Lover

Now if for some reason I change this sensor and the car still doesnt pass emissions ....I have changed the air filter....new spark plugs...oil change....what else might it be???

SRDiver

CAT

Benz Lover

And is that something I could do myself or is there welding or something technical involved that only a well seasoned mechanic shold do??

MTI

The catalytic converter is a bolt on section to the exhaust system after the manifold down pipes. Whether it's a DIY depends on the condition of the bolts and hangers. If they're frozen and you are on a ceeper under the car, you'd wish that you took it to a shop that had a lift.

Benz Lover

okay...now my car is going ...tst..tst...tst it sounds like something around the fan...not sure where its coming from...but one thing i do know is that maintaining this car is starting to get pricey.