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i changed my plugs but not the O2 sensor.. mine is just fine and i have done it twice.. one time i changed the plugs and the second time i didnt. i dont see it being a big deal unless your truck is really gummed up bad. go ahead and do it. btw the first time i did it i had 80k miles on my truck. no problems at all. i took the plugs out and other than them being shot to hell bc they had 80k miles on them they werent gummed up from the seafoam..
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