O2 Sensor Help - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 02-25-2008
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O2 Sensor Help

Well, i hooked my truck up to a scanner because of such bad mileage. and the o2 sensor in bank 1 section 2 or side 2 whatever it is called, had no voltage at all, which is the downstream o2. The check engine light is not on, and I was wondering if I should replace it or not? I also had a lazy o2 sensor which was replaced, and i was told that the downstream o2 sensor will not effect my mileage at all. What is your guys opinion? Thanks
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Old 02-25-2008
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if you know its faulting i would replace it
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Old 02-25-2008
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Quote:
Originally Posted by robj749840 View Post
i was told that the downstream o2 sensor will not effect my mileage at all.
Correct. The downstream sensor monitors cat efficiency only and has no effect on the air/fuel ratio.
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Old 02-25-2008
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well if it is not necessary im not going to spend the extra 50 dollars, i am not sure what I will do yet, i dont have alot of $ at the moment, and it is not throwing a code or anything
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