How To Diagnose and Fix EVAP Codes and Pass an Emission Test

In this video I go over all the main common causes of EVAP system problems and go over all the EVAP components, diagnosis, and their locations. How to fix EVAP error code or multiple codes that keep coming back. I also show common test methods for all the parts in a vehicle EVAP system. Includes overview, purge valve test, charcoal canister, vent valve, EVAP leaks and more.
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EVAP OBDII Code List and Description
P0440 Evaporative Emission Control System Malfunction
P0441 Evaporative Emission Control System Incorrect Purge flow
P0442 Evaporative Emission Control System leak Detected (small leak)
P0443 Evaporative Emission Control System Purge Control Valve circuit Malfunction
P0444 Evaporative Emission Control System Purge Control Valve Circuit Open
P0445 Evaporative Emission Control System Purge Control Valve Circuit Shorted
P0446 Evaporative Emission Control System Vent Control Circuit Malfunction
P0447 Evaporative Emission Control System Vent Control Circuit Open
P0448 Evaporative Emission Control System Vent Control Circuit Shorted
P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction
P0460 Evaporative Emission Control System Pressure Sensor Malfunction
P0461 Evaporative Emission Control System Pressure Sensor Range/Performance
P0462 Evaporative Emission Control System Pressure Sensor Low Input
P0463 Evaporative Emission Control System Pressure Sensor High Input
P0464 Evaporative Emission Control System Pressure Sensor Intermittent
P0465 Evaporative Emission Control System Tank Detected (gross leak)
P0466 Evaporative Emission System Leak Detected (very small leak)
P0467 Evaporative Emission System Leak Detected (fuel cap loose/off)
P0468 Evaporative Emission System Purge Control Valve Circuit Low
P0469 Evaporative Emission System Purge Control Valve Circuit High
P0465 Purge Flow Sensor Circuit Malfunction
P0466 Purge Flow Sensor Circuit Range/Performance
P0467 Purge Flow Sensor Circuit Low Input
P0468 Purge Flow Sensor Circuit High Input
P0469 Purge Flow Sensor Circuit Intermittent
P0496 Evaporative Emission System High Purge Flow
P0497 Evaporative Emission System Low Purge Flow
P0498 Evaporative Emission System Vent Control Circuit Low
P0499 Evaporative Emission System Vent Control Circuit High
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[@sbowman122]

This is by far the best video I have seen explaining the P0441 code. It sounds like my Corolla has the bad valve at the charcoal canister since it is constantly kicking off when I fill up with gas. Thank you for the great video!!

[@ricardochavez7674]

Thank you so much !!! I was able to reset a trac off/ check engine light that I had for months a some monsson floods in vegas. I guess some water got into the canister and messed something up in the system. I did all the steps from the engine all the way to the back of the car and it got cleared...

[@squidhound00001]

Awesome video man and thank you very much ! I’m getting a double P0446 code on my 2002 Avalanche. You’ve given me plenty of ammo to go after this problem. I’ll try and remember to report back my findings and hopefully 🙏 fixes !!

[@forbiddendonut]

this was a great explanation of the EVAP system. Thanks.

[@adamcrownvictoriacarrepair7105]

Your videos are fantastic.

[@mikepettengill2706]

informative thank you!

[@grantwolfenden2501]

2001 Tacoma 2.4l and my purge valve solenoid isn't actuating when i unplug the hose that goes to the charcoal canister. Is this normal???

[@HVAC_Mechanic]

I made a video how to test the purge valve in Gen 1 Tacoma's here is a video. ruclips.net/video/Qk7se8-7j6s/видео.html

[@grantwolfenden2501]

Will a po171 be a vacuum purge solenoid???

[@HVAC_Mechanic]

Usually, a bad stuck open purge valve causes rich codes. It could cause a lean code if it was stuck open and there was a leak, which would cause an intake air leak. You could block the hose going to the intake and see if the P0171 clears. An Evap code will likely come up, which should clear once it is hooked back up.

[@jonathansheeder5153]

I'm dreading getting to the charcoal canister on my RX350.

[@Harleyquin62]

I’ve replaced most of the parts to code PO446. And 6 gas caps ,all OEM. And still have a code on and off again. Why doesn’t GMC have a recall on this too many people are having this problem?