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Re: 2004 F150 5.4 '5' Lean codes P0171 and P0174
I had almost the same situation occur on my personal vehicle, an 04 F-150 5.4L 3 valve engine. I installed an Airaid aftermarket intake (similar to K&N), and it was fine for a few months, but started throwing P0171 and P0174 codes, and at times would stall dur... Login to read more. ![]()
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