Ford P0321 OBD-II Trouble Code Definition: P0321 Crankshaft Sensor Circuit Malfunction P0321 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0321 Ignition/Distributor Engine Speed Input Circuit Range/Performance What does the code mean? OBD-ii Code P0321 definition: The ignition engine speed sensor input signal to Powertrain Control Module (PCM) or Engine Control Module (ECM) is continuously monitored. The […]