O2 Operating Range


jtmarten
11-30-2013, 01:24 PM
What is the normal operating range reported on a scan tool of upstream O2 sensors for a '96 K2500 w/7.4, also for fuel trims?

Thanks!

777stickman
11-30-2013, 07:47 PM
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Tech II
12-01-2013, 12:30 PM
Normally large swings from 900mv to 100 mv.....

Fuel trims usually less than 10%, plus or minus....zero % would be a perfect running vehicle, so it will vary slightly above and then slightly below zero....

OBD I, didn't use a %, they used 128 as a base line, and readings would vary slightly above and below the 128....

jtmarten
12-06-2013, 06:33 AM
Thanks for the info. Was curious about it because I have one upstream O2 showing ~0.850 and the other showing ~0.08 at idle. I've been getting a bank lean code lately. I'm planning on replacing both upstream sensors.

j cAT
12-06-2013, 08:16 AM
Thanks for the info. Was curious about it because I have one upstream O2 showing ~0.850 and the other showing ~0.08 at idle. I've been getting a bank lean code lately. I'm planning on replacing both upstream sensors.

what you do when the readings are different is swap them . if the problem swaps it is the sensor if it is the same side you got engine problems.

could be vacuum leak.

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