Rangerguy
Well-Known Member
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- #1
My Ranger threw an engine check light: Power train control system, evaporative emissions system, excess vacuum fuel tank while driving. I took it in for service. They said the FTP (Fuel Tank Pressure) sensor was dirty with undercoating oil, cleaned it off, reset the calibration and cleared the check light (at my expense). They said the sensor is on top of the fuel tank. But I don't get it: is the sensor measuring atmospheric pressure so the system can compare that with air pressure inside the tank? And if it got dirty so it couldn't sense how could that be prevented in future?
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