Quote:
Originally Posted by murphysf
I changed the CAT and the vehicle passed smog today. NO way down, HC is down as well but still a bit high.
Still pan to change the O2 senor, it is super tight, multiple applications of PB blaster, will try to remove in teh next day or two if still tight will have someone take a torch to it.
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A new cat works wonders, and should cover up minor engine issues for awhile.
Did you try heating up the bung for the O2 sensor with a propane torch? It'll kill the sensor, but it's probably close to death already. The heat differential between the bung and the sensor should help fracture the thin layer corrosion in the threads. Once it starts moving, twist the sensor back and forth to grind the chunks of corrosion into dust, so the threads don't get jammed or tear (galling). Install new sensor with careful application of anti-seize on the threads to make removal easier next time.