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downstream oxygen sensor replacement help!

G

guitarguyucf

New member
So im at my wits end! I Got the 3 piece tool kit from Autozone and used the 7/8 which worked perfect for the upstream sensor. Basically the lower one is fused with the exhaust system and even after 4 soakings of pb blaster and wd-40 it wont budge...any suggestions???
 


Is it all that necessary to replace the downstream one? I did the upstream one because I had poor gas mileage, and figured I would just do both...but seriously i cant get this thing off and wondered if its worth the hassle?
 


put a pipe on the handle of the breaker bar to extend it some more if need be. itll come out.
 
Once it pops and breaks loose the corrosion it'll come out. Just be careful and work it back and forth with pb blaster.
 
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