Ford P0354 OBD-II Trouble Code Definition: P0354 Ignition Coil 4 Primary/Secondary Circuit P0354 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0354 Ignition Coil “D” Primary/Secondary Circuit What does the code mean? OBD-ii Code P0354 definition: The COP (coil on plug) ignition system is what is used on most modern engines. There is an individual coil for […]