You have 4 02 sensors. We need to know which one is setting the code and
what code is being set. There are around 40 different error codes for the
02 sensors, and without knowing which one, we can't help. Get thee to
Autozone and have them scan your computer (it's free) for DTC (diagnostic
trouble codes). It will look something like this : P # # # #.
When you get the code(s), post em here and we can troubleshoot for you. New
02's for yer' truck will run around $75 apiece, but there are many things
that can set 02 sensor codes that have nothing to do with the sensor itself.
Pretty easy to get to. You'dd need a 7/8" box wrench or 02 sensor socket +
a can of PB Blaster to get the sensor out of the manifold. These tools can
be bought at any auto parts store as well as the sensor.
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