I measured my old one and it's 22.1mm across the flats! That may be a 22mm open end with a bit of a grind or 7/8 inch. May be very difficult to get out if been in a while. I had to use stilsons! Buy a Lambda sensor thread chaser. My new sensor would definitely have cross threaded without first cleaning out the thread. Use a very small smear of copper lube on the threads when refitting. Pig to get at, need to remove shield and shift linkage.
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