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    O2's sensor downstream issue

    Hello to all, I have aquestion of oxygen sensor B2S1 of my ford automatic explorer sportrack 2003, 4.0, 6V. There is not Check engine light on. There is not reading with my scanner Image s1 just show 3 o2's sensors. But what's is the function of downstream sensor? on my scanner i...
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    O2s wave form

    Hello, I'm the owner of the Ford Explorer Sportrac 2003, V6, 4.0L and 200,000miles on the way:burnout:, and I bought a ODBII scanner and I read the O2s sensors and the wave forms you can look in the picture. I was reading it's a bad wave form, so I started to looking for a bad connection, and i...
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