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No any codes will let you fail..Rangers are bad about the valve sticking..But first look on th driverside very back on the intake..Youll see a valve with two vacuum lines The one that goes on the bottom of the valve makes a 90 bend and is bad about breaking..If the lines are good then work the valve by hand and see if it will move
I had the same issue with mine. Unscrew your instrument panel and pull it out as far as it will go. The lights are held in place from behind so you will need to slip your hand in and rotate the pastic clip that is fixed to the light to take it off. I never saw behind the panel but I heard it's fragile so be carefull. I replaced it with the ABS light (I already know my ABS doesn't work :P).
Ford:DTC P1401
Differential Pressure Feedback EGR Circuit High Input
did you do the pin point testes? a fault code only tell s the sensor signal has a problem, that can be the actual sensor or the connector, or the wiring or the powertrain control module, with this sesor you can also hook the hoses up wrong and excessive exhaust back pressure can cause this as well.
YOU CANT TURN OFF PCM WHEN IT SPOT A PROBLEM.YOU HAVE TO FIX PROBLEM.BECAUSE THE CHECK ENGINE WILL STAY ON UNTIL PROBLEM FIX. ITS AGAINST THE LAW TO TAMPER WITH EMISSIONS SYSTEM.BECAUSE OF SMOG AND POLLUTION LAWS..HAVE TRUCK SCAN TO SEE WHAT YOUR PCM CODE IS.COULD BE SOMETHING MINOR.
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