Mazda Mazda 6 The Engine Control Unit (ECU/ECM) with part number PYFA 18 881 is the mastermind of the engine management system in Mazda cars :Mazda: Technical Specifications and Compatibility • Original Part Number (OEM): PYFA-18-881 (and sub-codes like E6TA0671HS refer to the production line and software update from Mitsubishi Electric, the manufacturer of the part for Mazda). • Compatible Engine Type: 2.5L Naturally Aspirated SkyActiv-G engines. • Compatible Models: (Mazda 6 (Models from 2018 to 2024)).