DTC Codes

P0457 means a large EVAP leak, most often a loose or poorly sealing fuel cap. Check the cap first, then smoke-test for a leak elsewhere. Causes, symptoms, fixes, and cost. Video + FAQs.

P0456 code means a very small EVAP leak — a pinhole or hairline crack. Common causes, why it's hard to find, how to pinpoint it with a low-pressure smoke test, and cost. Video + FAQs.

P0441 code means incorrect EVAP purge flow. Common causes (purge valve, hoses, vent system), symptoms, how to diagnose it, and repair cost. Includes a video and FAQs.

P0455 code means a large EVAP leak. Common causes (often a loose or failed gas cap, or a disconnected hose/valve), symptoms, how to find it with a smoke test, and repair cost. Video + FAQs.

P0442 code means a small EVAP leak (around 0.040 in). Common causes, how it differs from P0456, how to find it with a smoke test, and repair cost. Includes a video and FAQs.