Lots of Liquid wrench and a overnight soaking helps if its really tight.
Also, to get the o2 sensor out a slotted socket is a must. Regular sockets
and wrenches are a pain to work with in this situation.
If all else fails, warm up the engine till the o2 sensor is good and hot,
then try breaking it loose again. Deep dig and find the hamfisted gorilla
within, these things can be tight!
Ken
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