Oxygen sensor question (1 Viewer)

Joined
Nov 6, 2011
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374
I had a engine code 21,24 replaced both upstream o2s. I’m still getting the codes. The o2 harness connectors from the truck are in pretty bad shape. I checked to see if I’m getting any signals from the truck side of the harnesses and I am. Any help? Thanks
 

Road Apple

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Joined
Nov 28, 2011
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880
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Santa Cruz, CA
I assume you’ve searched, but just incase you haven’t, these threads might help?

“So, I decide to get out the FSM (I know, about time:eek:) Went through the test and the O2 sensor was working fine, but the heater on the sensor was inop. All test indicate the ECM needs to be replaced.”


 

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