Dodge P1321 Electronic Ignition System Fault Line Description OBD-II Trouble Code Description for P1321 Dodge Electronic Ignition System Fault Line OBD-II Trouble Code Description for P1321 Dodge Ignition Coil.4 – Abnormal VAG OBD-II Trouble Code Description for P1321 Dodge Knock Sensor 3 Circ. Low Input