If you found this post, the Check Engine Light on your Toyota may be illuminated because of the dreaded P0441 error code. Luckily, there is an easy fix for this problem that will get you back up and running in no time!

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What is the P0441 – How do I Fix it?

The P0441 error code in a Toyota vehicle relates to the Evaporation Control (EVAP) System of the car. The P0442 and P0446 codes are similar and all relate to the EVAP system. The #1 reason the your car will give you this code is that the fuel tank cannot hold the correct pressure due to an old or loose gas cap. The seal is no longer holding a tight fit.

These are the definitions of error codes associated with a loose or faulty gas cap:

  • P0441 – Evaporative Emission Control System Incorrect Purge Flow
  • P0442 – Evaporative Emission Control System Leak Detected (Small Leak)
  • P0446 – Evaporative Emission Control System Vent Control


How do I clear the Check Engine Light?

The good news is that simply replacing the gas cap will make the error go away!

Note: for items like this, always go with the OEM (Original Equipment Manufacturer) item. Yes, there are cheaper replacements out there, but save yourself the aggravation of chasing down problems associated with aftermarket parts.

The following are links to the OEM Gas Caps for Toyota Sienna of different years:

How do you know if it is just the gas cap and not something else? Normally you will get one or all of the following error codes: P0441, P0442, and P0446. There may be others as well, but these are the most common. If you are getting all 3 of these codes together, there is a very good chance a leaking gas cap is the problem.

To fix the problem, replace the gas cap and reset the error codes. If you don’t have an OBD2 device (they are really cheap) to reset the codes, just drive for at least 100 miles after replacing the gas cap, and the errors will reset on their own!

Not sure how to reset error codes? Check out our guide on How to Reset the Check Engine Light.