I just replaced the oxygen sensor on my 94 Dak 3.9, when the light came on
and the o2 sensor code flashed. The truck ran great after i replaced the
sensor, but last night it started to hesitate on acceleration, and when it
did, the engine light came on again. When I reached my destination, I
flashed the code, and sure enough, 21 came up. Oxygen sensor. But the
problem is intermittent. When I started up the truck later, it was fine,
no light or anything. do I have a defective sensor, or (more likely IMHO)
is there a problem somewhere else in the O2 sensor circuit? does anyone
have experience with this? Any advice is appreciated.
Christopher Scott
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