Question

What are these codes 2010 Toyota Highlander 6cyl codes P0440, P0446, P0441? What are these codes?

Answer 1

Check and see if your gas cap is not loose, this is a common problem and also if the air filter was changed recently check and see if all the vacuum hoses are connected. These are the two main problems that I have seen.

If it's not either of those it might be related to the EVAP canister/ system

Answer 2

P0440 TOYOTA Code - Evaporative Emission Control System Malfunction
Read more: https://www.autocodes.com/p0440_toyota.html

P0441 TOYOTA Code - Evaporative Emission Control System Incorrect Purge Flow
Read more: https://www.autocodes.com/p0441_toyota.html

P0446 TOYOTA Code - EVAP System Vent Control Circuit
Read more: https://www.autocodes.com/p0446_toyota.html