Calling on 986 Forum Master Mechanics

[Jager]

Originally Posted by coolbreeze551

Please excuse my ignorance but how do you know it's the cat and not the o2 sensor itself? TIA

Update, I finally got around to swapping the O2 sensors behind the catalytic converters and no change, I am still seeing the same voltage drops on the O2 sensor on Bank 2... Darn it.