P0268 means Cylinder 3 Injector Circuit High. The DME records it when the cylinder 3 injector circuit remains high or shows an open-load response to a valid command; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0267 means Cylinder 3 Injector Circuit Low. The DME records it when the cylinder 3 injector circuit voltage stays low or current draw is excessive during actuation; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0265 means Cylinder 2 Injector Circuit High. The DME records it when the cylinder 2 injector circuit stays electrically high or cannot be pulled low when commanded; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0264 means Cylinder 2 Injector Circuit Low. The DME records it when the cylinder 2 injector control circuit remains electrically low or draws an implausibly high load; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0523 means Engine Oil Pressure Sensor/Switch High Voltage. The DME records it when the oil-pressure signal remains electrically high or outside its rational operating range; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0522 means Engine Oil Pressure Sensor/Switch Low Voltage. The DME records it when the oil-pressure signal remains electrically low or reports implausibly low pressure; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0521 means Engine Oil Pressure Sensor/Switch Range/Performance. The DME records it when measured oil-pressure feedback does not track engine speed, temperature and load plausibly; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0520 means Engine Oil Pressure Sensor/Switch Circuit Malfunction. The DME records it when oil-pressure feedback is electrically implausible or inconsistent with engine operation; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0513 means Incorrect Immobilizer Key. The DME records it when the presented key identity or start authorization does not match the immobilizer data accepted by the vehicle; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0506 means Idle Control System RPM Lower Than Expected. The DME records it when actual idle speed remains below target despite increased idle-air or torque correction; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0457 means Evaporative Emission System Leak Detected Fuel Cap Loose/Off. The DME records it when the EVAP monitor cannot hold the expected vacuum and interprets the leak as cap-sized; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0453 means Evaporative Emission System Pressure Sensor/Switch High Input. The DME records it when the EVAP pressure-sensor signal remains electrically high or indicates impossible tank pressure; diagnosis must prove the named circuit or mechanism before parts are replaced.