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O2 sensor question


srteach

Well-Known Member
Joined
Aug 11, 2007
Messages
977
Vehicle Year
1999, 2001
Transmission
Manual
99 4.0XLT 4dr 4wd Is the after cat O2 sensor voltage supposed to fluctuate like the pre cat O2 sensors? The pre-cat sensors fluctuate from .2V to .8V. the after cat O2 is steady at .650V to .655V. I think it may be toast. Opinions?
 
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