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Home >> Audi >> 2015 >> A4 Prestige >> Repair and Diagnosis >> External Pages >> Different car >> Section 380 (Engine Control System (Diagnostic Codes (P0300-P148F))) >> SFI System >> DTC P0455: Evaporative Emission Control System Leak Detected (Gross Leak); DTC P0456: Evaporative Emission Control System Leak Detected (Very Small Leak) [08/2013 - ] >> DTC Summary

DTC Summary

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
DTC No. Monitoring Item Malfunction Detection Condition Trouble Area Detection Timing Detection Logic
P0455 EVAP gross leak Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. Reference pressure is measured at start and end of leak check.
If stabilized pressure is higher than [second reference pressure x 0.2], ECM determines that EVAP system has a large leak.
  • Fuel cap (loose)
  • Leakage from EVAP line (canister - fuel tank)
  • Leakage from EVAP line (purge VSV - canister)
  • Leakage from canister pump module
  • Leakage from fuel tank
  • Leakage from canister
  • Leakage from No. 1 canister
 While power switch off 2 trip
P0456 EVAP small leak Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. Reference pressure measured at start and end of leak check.
If stabilized pressure is higher than second reference pressure, ECM determines that EVAP system has a small leak.		 While power switch off 2 trip
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