Check Engine - O2 Sensor and Idle Speed Control

[nodoubts2k]

Ok, so the check engine on my 98' 528i is on, i hooked it up to the comp via OBDII diagnostic, and it said Idle speed control sensor and Front oxygen sensor was bad. Where can I get the oxygen sensor, and which one do i have to change, and Where the hell is the idle speed control sensor?

[frisko415]

the computer was suppost to tell you if its before or after cat conv. and if u say its front it was supost to show u bank I or bank II i believe bank I is the right one and II is left correct me if i am wrong

[joyfret]

the computer was suppost to tell you if its before or after cat conv. and if u say its front it was supost to show u bank I or bank II i believe bank I is the right one and II is left correct me if i am wrong

You're correct. The scan should show which bank is failing.
When I did mine few months ago, my mechanic showed me
the scanner which indicated bank 2 was at fault.

You can buy O2 sensors at various vendors sponsoring this
board. Check them out on line. They should be around $100.00 ea.

[koister2001]

I recently bought from pelicanparts. They have pre-cat O2 sensors on sale with free shipping.