We own a 2003 Toyota Prius with 106,000 miles and the Check Engine Light is currently on. The OBDII scan reveals three EVAP system-related codes: P0440, P0441, and P0446. Are these separate issues or part of one underlying problem? Any insights would be greatly appreciated. Thank you, Haskins
We've already checked the gas cap — it's secure and properly sealed.
If the air filter was serviced recently look at the air box and make sure all the lines and connectors are plugged in. They tend to get left loose sometimes.
Refer to these OBD-II code explanations for more detail: http://www.obd-codes.com/p0440 and http://www.obd-codes.com/p0441. Additionally, searching forums like PriusChat.com may reveal experiences from other 2003 Toyota Prius owners who've encountered similar issues.
First, if I were you, I'd check the gas cap for looseness and ensure it's securely tightened. A loose cap is a common cause of EVAP system faults in older Prius models.