hai all...
I got my check engine lights on, and got checked by autozone staff, the code was P0141 and it said :
Definiton :
H02S12 heater condition (Heated oxygen sensor-Bank 1 sensor 2)
Explanation :
The computer has recognized a failure in this circuit
Probable cause
- faulty H02S12 (Bank 1 Sensor 2)
- Poor connection at oxygen sensor
- Check circuit-fuse

the guy said, i can do some steps
- disconnect the 02 sensor and reconnect (reset)
- check fuse
- replace the 02 sensor..

does it work? bcause they suggesting me to add Lucas fuel additive first, and the light still on.
can i reset these sensor just like what he said? or i need to replace it?
and any idea where the position is, since this car has four 02 sensor ( two before and other two after cat converter)

thank you guys....

 

number 12 on picture, right/passenger side after cat converter

 

Just replace the sensor. when you do go to the Mercedes dealer to get it . i replaced mine on a dodge dakota a few years back (it had 6 yes i said six of the D^%$ things)
and tried an after market one and had nothin but problems with the vehicle. The after market was 65 bucks and the one from the dealer was 110.00 but the aggravation
wasnt worth the 45 dollar savings and the dealer one had the right end on it to match the wiring . Then go find some corrosionX HD its a dielectric grease that will keep the moisture and dirt out of the conector.
just my 2cents
BTW i wouldnt add anything to your fuel unless its a diesel.JMO

 

i found your sensor here.....its a OE part kinda far down though
http://www.autopartswarehouse.com/search/?N=0&VN=4294966748+4294965117+4294967178+429496442 2+4294967215&Nr=AND(universal:0)&No=50&Npp=10


HTH
i think this is the part number you need on the site just double check though.
Part Number: W0133-1788423
Manufacturer Number: W0133-1788423

 

thank you guys for the info..that would be great..
to ontmiss : but i forgot to post, my car is 1999 c280, is the position same with the picture you sent me?
to Allard : i found all the sensors was for 2005 c230, is it gonna fit for 1999 c280?

once again thank you guys for the advice....

 

http://www.rmeuropean.com/mercedes-parts.aspx#Category

http://www.rmeuropean.com/Part-Numbe..._94E6B777.aspx

http://www.rmeuropean.com/Part-Numbe..._94E6B777.aspx

Position is same. It should be easy to find out. First clear the code then unplug oxygen sensor connector and start engine. If it shows you same code (P0141) then you are on right one, if you unplugged wrong one then different code will pop up.

 

sorry thought you had a c230. im sure that site will have the one for you car though. you might need to look around a bit on the site.

 

what's the different between 3 wire and 4 wire?
and i found one with connector, and the other just naked wire..
which one should i buy?

before and after cat, all the same?

thx guys....

 

look for the one that has a (OE) that means Original Equipment. it should have the right
end on it.