Question about 1995 Ford Windstar

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Code PO171 check engine light on hard first gear losses power on second slow throughout

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That code is lean on bank one which be a vacuum leak on that side which could be cuzin your lack of power

Posted on Jul 27, 2009

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What is these codes telling me? PO133 and PO171


PO133-mostly it's Oxygen Sensor Circuit Slow Response (Bank1, Sensor1)
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First step is to look up Jeep trouble code PO171
This is the link I found:
http://engine-codes.com/p0171_jeep.html

I don't know about the airbag or abs lights. My old AMC concord used to light up all sorts of odd ball combinations of lights to signal stuff not related. You could look under your seat to see if any wire harnesses have come unplugged by stowing things under the seat but if nothing is hanging down obviously I would focus on the code PO171 first. Which as you can see has a lot of possible fuel and air type problems. It points you in the general direction. It is the actual behavior and performance of the engine that is your main concern. How is it running and is there any other symptoms or power loss you can feel and when? Have you done your regular maintenance and replaced your air filter or any recommended fuel filter changes from the owner's manual? If that stuff is done often the appropriate spray cleaner from the auto parts store can get things back without any repair at all. I sprayed one sensors harness with electronic cleaner and my code went away because oil and dirt from my smoky engine was blocking the signals.

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Had Po171 code due to failed emissions test..check engine light is on..So I had the mass air flow sensor replace, bothe oxygen sensors, pcv valve, air filter and also had tune-up and check engine light is...


replace the gas cap.. unless your car loss power when u give it gas.. and when u c a hill and it does not have power.. then its not the air mass flow sensor.. however u did everything but the gas cap

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What are the symptoms of a speed sensor going bad on a 1997 jeep grand cherokee laredo 6 cyl.


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Po171 po172 po174 po175 ???


If the fuel pressure was low enough to give lean codes then u would have a loss of power that you would easily notice, you say you checked for vacuum leaks, did you use a can of carb spray or a bottle of propane? it only takes a very small leak to trigger the codes, spray carb spray around the intake area, see if the engine sound changes, this will indicate a leak,

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