oxygen sensor 1 is bad which do i replace

[94530inh]

i have to replace sensor one but i dont know which one it is. Where can I find out? I left my bentley at home!

[yaofeng]

One is the driver side I believe.

[winfred]

i am reasonably sure it's the left side, but i wouldn't just do one

[chiefcorey]

Okay, this is what I've been told by others on this forum.

If it's been more than 50,000 miles since they've been changed, then you should do them. If one is gone, the other likely is, or is close to it to.

So do both, it's worth it.

And to buy it, here's a link for you to find them at a decent price. Someone else had also given me this link.

http://www.pelicanparts.com/BMW/catalog/shopcart/BE34/POR_BE34_EXHmuf_pg2.htm

Enjoy.

[markus]

i would do both at the same time as well. They arent too expensive but I have a question. Dont mean to thread jack but on V8 models if you switched the connectors for the 02 sensors would it kick off a check engine light? reason is because I did tranny mounts and had to disconnect 02 sensors to get to them.

[BillionPa]

shouldnt throw any error, unless the engine has problems, then you could have some new more serious problems.

[winfred]

it would definatly piss it off, if you look at how the wires are run you can see which one is which, the computer adjusts the mixture separately for each bank of the motor, it would probably set a 02 control code for both sensors but not before screwing up the short term fuel trims, resettable on obd I cars by killing the battery


i would do both at the same time as well. They arent too expensive but I have a question. Dont mean to thread jack but on V8 models if you switched the connectors for the 02 sensors would it kick off a check engine light? reason is because I did tranny mounts and had to disconnect 02 sensors to get to them.

[Bill R.]

correctly.




it would definatly piss it off, if you look at how the wires are run you can see which one is which, the computer adjusts the mixture separately for each bank of the motor, it would probably set a 02 control code for both sensors but not before screwing up the short term fuel trims, resettable on obd I cars by killing the battery

[markus]

alright kool. just making sure i didnt screw anything up.

[632 Regal]

i have a couple miles on the originals and still need to sort the front throttle body gasket before I change mine.

lets see what a new one does... *patiently waits*

[brosher]

How are you determining that it is bad? If you are going by the CEL codes than it is possibly intake gaskets that are your problem.

[fkong777]

I just changed both my 02 sensor and the car seems slower. I got the correct bosch parts with OEM connector too. DO I need to reset the DME?

[94530inh]

I've got the code for sensor one. I used to have knock sensor codes and theyre gone now. I bought 2 knock sensors and two o2 sensors. And intake gaskets etc. I'm going to replace the o2 sensors first and see if that works. They have been in there since i bought the car so they need replacement anyway.

[winfred]

it will learn on it's own in a few days of driving as the sensors break in


I just changed both my 02 sensor and the car seems slower. I got the correct bosch parts with OEM connector too. DO I need to reset the DME?