P0273 means Cylinder 5 Injector Circuit Low. The DME records it when the cylinder 5 injector current or voltage indicates a persistent low-circuit condition; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0271 means Cylinder 4 Injector Circuit High. The DME records it when the cylinder 4 injector circuit stays high or fails to sink current when injection is commanded; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0270 means Cylinder 4 Injector Circuit Low. The DME records it when the cylinder 4 injector control circuit is held low or loads the driver beyond its expected range; diagnosis must prove the named circuit or mechanism before parts are replaced.
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.