P0505 means Idle Control System Malfunction. The DME records it when actual idle speed or idle-air authority cannot follow the DME target; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0492 means Secondary Air Injection System Insufficient Flow Bank 2. The DME records it when the bank 2 pre-catalyst lambda response fails to show the expected cold-start air flow; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0491 means Secondary Air Injection System Insufficient Flow Bank 1. The DME records it when the bank 1 pre-catalyst lambda response does not confirm commanded cold-start secondary airflow; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0446 means Evaporative Emission System Vent Control Circuit. The DME records it when the tank-ventilation vent function does not respond electrically or functionally as commanded; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0443 means Evaporative Emission System Purge Control Valve Circuit. The DME records it when the purge-valve electrical load does not match the DME command; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0344 means Camshaft Position Sensor A Circuit Intermittent Bank 1 or Single Sensor. The DME records it when the intake-cam position signal intermittently disappears or loses correlation; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0339 means Crankshaft Position Sensor A Circuit Intermittent. The DME records it when the engine-speed reference drops out intermittently while the crankshaft is turning; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0328 means Knock Sensor 1 Circuit High Input Bank 1 or Single Sensor. The DME records it when the knock channel shows excessive voltage, noise or implausible activity; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0327 means Knock Sensor 1 Circuit Low Input Bank 1 or Single Sensor. The DME records it when the knock-signal amplitude remains electrically or physically implausible low; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0308 means Cylinder 8 Misfire Detected. The DME records it when the crankshaft speed pattern identifies repeated combustion loss on cylinder 8; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0223 means Throttle/Pedal Position Sensor/Switch B Circuit High Input. The DME records it when channel B remains electrically high or indicates an impossible opening; diagnosis must prove the named circuit or mechanism before parts are replaced.
P0222 means Throttle/Pedal Position Sensor/Switch B Circuit Low Input. The DME records it when channel B remains electrically low compared with the redundant position signal; diagnosis must prove the named circuit or mechanism before parts are replaced.