Ford U3004 OBD-II Trouble Code Definition: U3004 Accessory Power Relay U3004 Ford OBD-II Trouble CodeDescription: Trouble Code: System: Subsystem: U3004 – (ASE) Network Communication Fuel & Air metering, Auxiliary emission controls DTC Description: Accessory Power Relay Location: Analysis: Likely Cause: Relay Control Circuit Notes: […]