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Howdy folks, I have a 2013 Express with a 4.3. I recently experienced a couple of episodes of stalling, and then rough running on restart. Both occurred when I put the van in reverse, to back up to a bay door. Had been running fine before then, and when I started back up and drove out in drive, everything's fine again. Intermittent fault in a knock sensor already had the light on for over a week ( those sensors are a labor intensive fix, I planned to get to it as soon as I had time ) but I did another code read, and bank 2, number 2 O2 sensor had thrown pretty much every trouble code it could. My question is, could the downstream sensor cause the stalling/ rough run, especially only in reverse? I know that in the past, downstream sensors did little or nothing to affect computer adjustments. But had this changed by 2013? Or, could all this be the symptoms of a wire harness or ECM problem?
 

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The downstream O2 sensors are used to measure the efficiency of the cat converter. You may have a wiring issue or O2 sensor is bad. When placing the truck in reverse the wiring may move a bit and could be chaffed if rubbing anywhere under the truck.
Knock sensors can affect engine performance as they are in charge of detecting pre-ignition and early detonation. They retard timing to prevent this.
 
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