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2006 Beetle with a 2.5L with P0171 Lean code. The PCV diagram had already been replaced with a dorman one. I ruled out a bad dorman PCV diagram after hooking up a vacuum gauge at the oil dip stick tube and didn't see any vacuum present. Next I turned to Fuel pressure and found an issue. First The pressure at hot idle was out of spec and second the fuel pressure drops under load.