So according to some of the more knowledgable folks, and thanks for sharing, this is a fuel system supply code. I have not reset the ECU to make sure it comes back but besides that, any advice on where to start on anyhting obvious would help.

 

I forgot to mention that it has 210,000 miles on it.

 

Ran a half pint of sea foam through the PCV to blow out any residue. CEL came back on this morning.

 

You can do some testing of the O2, or if money isn't that big of an issue get a new O2 sensor and see what you have from there.

 

can a crack exhaust manifold cause it too throw that code too? mines is crack before the o2 sensor.

 

any ideas? ^

 

Not so much on OBD-I systems......there is no "after" test.

 

Here is the troubleshooting guide for that code. Hope it helps.

 

Thanks FiveTen, Been out for a bit but I'll be working on this pretty quick. I'll post the results.

 

Lost Again's advice is what I would do, the O2 sensor is likely the culprit.

 

Used FiveTen's advice and didn't get any voltage out. Also went with one books recommended bench test for resistance readings between pins A/B and also A/C and A/D. All showed completely open. Brough the sensor to the auto shop and measured the new sensor's resistance measurements and they also showed completely open when there should have been something between 10 and 40 ohms between A/B. Anyway, replaced the sensor and haven't had the CEL come up again after a couple of days driving. So I am calling it fixed.