EVAP System Explained — Diagnose and Fix Check Engine Light Codes

Is your check engine light on with a P0497 code? Don’t panic — this video shows you exactly how to diagnose and fix it yourself, step by step! I’m Mike, the Backyard Mechanic, and today we’re tackling an EVAP System Low Purge Flow issue (Code P0497) on a Honda Pilot — but this repair process works for most cars and trucks with similar emissions systems. You’ll learn: ✅ How the EVAP system works (and why your gas tank isn’t sealed tight) ✅ The real cause behind codes like P0497, P0441, P0443, P0455, P0456, and P145C ✅ How to test your purge valve, vent valve, and canister ✅ Simple DIY tricks to find leaks — no expensive equipment needed ✅ Why cheap Amazon emissions parts can cause bigger problems later Whether you’re trying to clear that annoying check engine light, save on repairs, or understand what your car is telling you, this video walks you through the complete EVAP diagnosis and fix. 🛠️ Smoke Machine https://amzn.to/4hxzcnh 🛠️ Hand Pump https://amzn.to/3JbjPnQ 🛠️ Hose Removal Pliers https://amzn.to/4oFKB6L 🛠️ Hose Gripper Pliers Set https://amzn.to/4qyHZtc 🛠️ Hose Clamp Pliers https://amzn.to/4o6Ha9e 🛠️ OBDII Scanner Android Only https://amzn.to/432OgmQ 🛠️ OBDII iOS & Android https://amzn.to/47NvfYc 🛠️ My OBDII https://amzn.to/4hvTxcF 🛠️ Bounty Paper Towels https://amzn.to/4qtgLEp ⭐ My Patreon! https://www.patreon.com/cw/MiketheBackyardMechanic Many images used from Free Pik: https://www.freepik.com I get most of my sound effects from https://pixabay.com/ Disclaimer! Mike does stuff to entertain you, not for you to try some of the stupid things he does and get you hurt. 00:00 Describing the P0497 and related codes 01:48 EVAP System Diagram 03:42 Why emissions problems trigger your check engine light 05:59 Diagnosis: gas cap and smoke test 07:26 Testing the purge valve 08:05 Testing the canister vent valve 09:11 Testing the EVAP canister 10:05 Replacing the purge valve 11:33 Like this video! 12:12 Results of replacing the valve - did it work? 13:11 Conclusion Formerly Mike the Backyard Mechanic. #P0497 #EVAPSystem #CheckEngineLight #HondaPilot