Ford P0551 OBD-II Trouble Code Definition: P0551 Power Steering Pressure Sensor Circuit Range/Performance P0551 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0551 Power Steering Pressure Sensor/Switch Circuit Range/Performance What does the code mean? OBD-ii Code P0551 definition: Power steering pressure (PSP) sensor is installed to the power steering high-pressure tube and detects a power steering load. […]