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
) 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.”
