A loose or improperly affixed gas cap; A non-conforming gas cap (i.e. not factory/original brand); Other leak or damaged piece in EVAP system

Read the code and live data with an OBD-II scanner; Look for exhaust or vacuum leaks and check the wiring of the sensor or valve; Test the part before replacing it; Fix the cause, clear the code and test-drive

P0455 on Toyota Corolla E140: Evaporative Emission Control System Leak Detected (large leak)

Short answer: P0455 means “Evaporative Emission Control System Leak Detected (large leak)”. The car’s computer has found a fault in the Emissions system and turns on the Check engine light (MIL). First check: read the code and live data with an OBD-II scanner.

Standard OBD-II code Same meaning on all cars (SAE J2012). Not checked against this car’s factory manual.

Code: P0455
System: Emissions
Dashboard light: Check engine light (MIL)
Applies to: Generic OBD-II meaning. Not every code is used by this car.
Confidence: medium (generic OBD-II definition, not checked against the factory manual for this car)
Source: obd-codes.com

Symptoms and when it is set

Check engine light on
You likely won't notice any drivability problems

Likely causes

A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
Other leak or damaged piece in EVAP system

What to check, in order

Read the code and live data with an OBD-II scanner
Look for exhaust or vacuum leaks and check the wiring of the sensor or valve
Test the part before replacing it
Fix the cause, clear the code and test-drive

Related on this car

Same code on other cars

← P0446 P0500 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.