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How hard is it to replace an O2 sensor? 200 1980

If you decide to replace it afterall, it comes out easiest by heating the whole area red hot with a butane torch then immediately put a large ice cube on the O2 sensor without touching the cat or exhaust. This will break the seal and it should turn out easily.
--
1990 740GL Wagon 220,000 Miles AW70L B230F 8 Valve Non-Turbo Regina






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