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I currently have a similar issue- I have both P115 and P119. I bought new O2 sensors after my header install and both codes came up. I found a thread on another forum that said the resistance on the two heating wires should be between 1.8 and 2.5 ohms. My new ones were 3.4. The old ones were 2.5. I contacted the manufacturer (SNG) and they said my new ones were defective. I returned them but have not purchased another set yet.
Might be worth it to check the two white wires on both sides.
Good luck.
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