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Getting p0171 and p0174, this code is usually always related to a intake leak on any car or truck. it is very common on BMW’s but my friends windstar van also had the same code with a hose sticking out of the intake creating unmetered air that the computer was picking up on. with having this code you most likely are suffering rough idle, bad gas mileage, and surging while cold and even driving. if you see this video and you don’t own a BMW check your intake hose for rips and tears