1998 service engine soon

[rdwr01]

I have a 1998 Frontier and the service engine light stays on most of the time.
I can disconnect battery and reset it and it might be good for 2 miles or 200 miles than back on.
I have been told it is a oxygen senor but there are 2 and I can replace one and if it does do the job replace the other.
I know Ican find them online cheaper but locally both were over $100 each.
Any suggestions or any way to tell exactly which senor to replace?

Also I have left idling for up to 30 minutes and the light will go off and stay off for several hundred miles
Thanks

[kris]

Originally Posted by rdwr01

I have a 1998 Frontier and the service engine light stays on most of the time.
I can disconnect battery and reset it and it might be good for 2 miles or 200 miles than back on.
I have been told it is a oxygen senor but there are 2 and I can replace one and if it does do the job replace the other.
I know Ican find them online cheaper but locally both were over $100 each.
Any suggestions or any way to tell exactly which senor to replace?

Also I have left idling for up to 30 minutes and the light will go off and stay off for several hundred miles
Thanks

If you get the code, it will usually tell you which bank. From there you can narrow it down to front or back.

You could try here also for O2 sensors, http://oxygensensors.com Their prices are pretty good.