Weekend with Oxygen Sensors

Repair was not on a Jeep but Jeeps have Oxygen sensors just like everything else on the road so this thread might be useful to fellow jeepers. The time will come when the dreaded CEL appears and if the scan code(s) indicates an issue with the Oxygen sensor get ready for some nut busting adventures as the sensors usually rust in good and tight. Had 2 oxygen sensors to replace on a 93K vehicle, one under the hood and the other under the vehicle. Both sensors were removed relatively easily but the EZ one under the hood had buggered threads on the exhaust manifold. The repair to the threads could range from EZ (thread chaser) to medium PIA (tap) to extreme PIA (weld on bung). Fortunately it was a medium PIA under the hood as the slow tedius process of turning a tap with 3 sizes of adjustable wrenches depending upon tap orientation in the narrow space.

Soaked the oxygen sensor with some PB blaster or equivalent
Used an oxygen sensor removal socket
Used an oxygen sensor thread chaser
Used supplied copperish looking anti-seize
Used a M18x1.5 tap







This backtap looks like an interesting tool to keep debris out of an engine which was not a concern when dealing with an exhaust manifold. Check out the video


https://www.youtube.com/watch?v=njkT3TW3kKk