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I just Bought a 1998 Ford Contour, it is a Manual Transmission, and i have been getting these codes PO171 and P1506. PO171 which is System to Lean (Bank 1), what could i possibly do to fix this? Second is P1506 which is the Idle Air Control System Overspeed Error, I have tryied to see if it was the Cruise Control But it wasnt that...Any ideas what it could possibly Be?