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So, I had the code for the downstream sensor on this '05 that I bought my son. I bought a new AC Delco O2 sensor and installed it with no issues.. We drove the car for a while and had no light, until about 10 minutes later when the CEL came back on...

After digging around a while, I found a wiring loom on the left aft corner of the engine rubbing against the block which wore through the conduit and was shorting out ONE wire against the block.

Guess which wire was shorting out....

After moving that loom and recovering the wire, we drove the car with no issue. I spoke to my son today and he tells me there's no lights on the dash, so hopefully that was it...

Just wanted to share the findings
 
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