Hi, i just got a check engine light. Scanned it and received error code p0141 o2 sensor heater bank 1.
Car has 100k and ive never changed them.
I just wanted to know which one and where its located exactly. After i scanned the code the check engine light never came on? Any idea to this?


Also which one is it so i know which to buy thank you guys!

http://www.autohausaz.com/search/pro...xygen%20Sensor

i found some of the o2 sensors on there but not sure which it is. car is a 99e430

 

replacement items.So if on a budget do the 2 pre cat ones first as they are the ones that do all the real work.
You can get oe easy splice ones from
www.ngk.com
easy to connect to the old wires and saves a bunch of moola.
your code bank 1 passenger side o2 post cat means it is getting lazy and can't keep up.
If it cleared and stays cleared wait a bit and replace all 4.
Also check cat efficiency. And clean your mass air sensor
crc brand mass air cleaner and procedure on www.benzworlld.org w210 diy section.
Time to do air filter and fuel filter at the same time. And at 100k you need to be doing plugs.
I have the special 17mm boot removal tool on sale.

 

Thanks a lot ohlord. I am changing out the secondary cats next week, those are also original. The plugs i managed to do those early on. I will look into doing the fuel filter, and changing the two o2 sensors as you mentioned.
Thanks for your advice!