by 
JBRoot55
ANSWERS: 3
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most are located by the bottom of the headers. and all you should have to do is losen it!
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take the wire connecter loose. senser takes a 7/8 wrench, i think. just remove it, instatall new one.
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You can purchase an O2 socket also. The upper one is tough sometimes you may have to heat the pipe or get the engine to operating temp. before taking it out. The lower one should be easy to take out.
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