Originally Posted By: The_Eric
Next time cut the pigtail off and put the box end of a 7/8 wrench on there. Use a big mallet or hammer for extra motivation. Try it cold first and if that fails get it red hot.
^This. That is the best post on this subject. I recently replaced a factory O2 sensor on my '97 F250 that has 250K miles on it. It took a close-ended wrench and lots of heat. It complained the whole way out. No threads were hurt.
Next time cut the pigtail off and put the box end of a 7/8 wrench on there. Use a big mallet or hammer for extra motivation. Try it cold first and if that fails get it red hot.
^This. That is the best post on this subject. I recently replaced a factory O2 sensor on my '97 F250 that has 250K miles on it. It took a close-ended wrench and lots of heat. It complained the whole way out. No threads were hurt.
