1131= Lack of Upstream Heated Oxygen Sensor Switch.Sensor Indicates Lean ( Bank #1)...what this means idk...this is from my Chilton manual. Good luck, maybe someone can decipher it.
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 2008 f150 supercrew, 5.4, 3.73 LSD, tonneau cover, 275-65-18 BFG's. Gryphon programmer. XLT with XTR package. Tinted heads and tails with 8000 HID's. 4300 in the fogs. Gott's Mod. Painted grill.
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