Your welcome. :)
The front O2 tells the computer how much fuel to deliver. The rear O2 Checks on the function of the catylitic convertor.
There are 37 generic OBDII codes for O2s. :
Many things can be bad. The O2 itself, the wiring, the heater circuit, a blown fuse, and more. Best to narrow down the problem.
Good luck and let us know. :)
Saturday, April 8th, 2006 AT 5:50 PM