O2 ranger p0171 and missing on all cyl.!!!! - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 09-09-2010
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O2 ranger p0171 and missing on all cyl.!!!!

Hey guy i have an 02 ranger 2.3l 4 cylinder and it is throwing a p0171 (lean bank 1) p0301 p0302 p0303 p0304 (misfire on 1 2 3 4 cylinders) Now i have done some research on here already and heard about vacuum leak issues and have soaked the entire motor (vacuum lines included) in starting fluid and can find a leak!! i have also replaced the MAF and done a fuel pressure check (65 PSI) and i can not find the issue. So where do i go next? Maybe the MAP or BAP sensor? It has 170k miles just incase you guy need to know that. Thanks
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Old 09-09-2010
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Anyone?
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Old 09-09-2010
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check you ECT sensor, and sounds like you may need a coil.
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Old 09-09-2010
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Originally Posted by ccosgrove71 View Post
check you ECT sensor, and sounds like you may need a coil.
That was my next step. Thanks for your input i will ohm out the coil tomorrow.
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