Quote:
Originally Posted by scope103
The O2 sensor, when warmed up and running, should fluctuate back and forth between about 0.25 volts and 0.85 volts about 8 times in 10 seconds. (you may need to run the truck at about 2500 rpm to keep the sensor temperature high enough, but mine will fluctuate correctly at idle). If it is just sitting at 0.45 volts, most likely the sensor is dead. .
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That's right.
The critical parts are having the truck fully warmed up and running it at RPM (not idle) to see it dither. Personally, I like to test it at the ECU with it plugged into the computer, just probe the back of the connector.
There's no "fixed value" test for the 02 sensor - it's meant to be dyamic.
Testing it at idle won't work - these trucks idle rich from the factory.