Ford P0541 OBD-II Trouble Code Definition: P0541 Intake Air Heater Relay 1 Low P0541 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0541 Intake Air Heater “A” Circuit Low What does the code mean? OBD-ii Code P0541 definition: The engine control module (ECM) uses an intake air heater (IAH) to warm the incoming air for proper cylinder […]