Every EVAP Trouble Code In Plain Words
P0440 to P0457 cover leaks and the tank sensor, P0496 and P0497 cover purge flow, and P2400 to P2450 cover the leak pump and switching valve. Pick yours.
How To Read An EVAP Code
A P0 code is generic and means the same on most makes. A P1 code is set by the carmaker, so P1450 on a Ford and P1456 on a Honda mean different things. Carmakers word the same code a little differently. We show each wording with the bulletin it came from. The codes with a leak size are P0442 at 0.040 inch and P0456 at 0.020 inch, per the federal rule.
A code tells you where the computer saw trouble, not which part failed. Read more about how the light and a smog check fit together in check engine light and smog check.
Author Source EEAT Authors · Anthony's Author Page
Sources For This Page
- 40 CFR 86.1806 17, Onboard diagnostics, US EPA, Code of Federal Regulations (via Cornell LII), read 2026-11-12
- 13 CCR 1968.2, Malfunction and Diagnostic System Requirements, OBD II, California Air Resources Board (via Cornell LII), read 2026-11-12
Supercanic In San Jacinto
1685 S State St Suite D, San Jacinto, CA 92583. We test EVAP leaks with a smoke machine.