4 0 Ford Engine Control Module (ECM) for a Ford VARIOUS MODELS $200 USD Good used, cleaned, inspected Ford ECM. Part Number: S66FF. 30 Day Guarantee for swap or refund if not programmable. ECM's need to be programmed for your application. ConditionUsedFits To Make(s)FORDFits To Model(s)VARIOUS FORD MODELSPart NumberS66FFStock Number1066755 MLS Number14000108CategoryEngine Control Modules (ECM) Last Updated11/25/2025 LocationFitchburg, MA, US Sold ByRydemore Heavy Duty Truck Parts (888) 519-___ SHOWNUMBERCall Seller Email Seller Save More Info