Índice de códigos de avaria · medium
P0456
EVAP system leak detected – very small (0.020 in.)
EVAP system leak detected – very small (0.020 in.)
Scope: 2.5L/3.0L gasoline · System(s): EMS OBD II · Factory MIL flag: 2 · Default action: ECM Default: –Canister purge inhibited –Adaptive fuel metering inhibited
Common causes
- Fuel cap seal defective EVAP system leak (canister damage, pipework damage) EVAP Canister purge valve to ECM drive circuit: open circuit, short circuit, high resistance EVAP Canister purge valve power supply circuit: open circuit, short circuit EVAP Canister purge valve to engine purge pipe: restricted, leaking EVAP Canister purge valve operating vacuum hose leak / restriction EVAP Canister purge valve failure Fuel tank leak
Quick checks
- Confirm freeze-frame and conditions when the code set
- Inspect connectors, grounds, and harness for the circuit named in the code
- Compare live sensor values vs expected (unplugged/biased sensors are common)
- Check intake boots, PCV, and vacuum lines for splits (very common on aged X-Types)