My sister has a low mileage 2003 Toyota Highlander V6 that has begun to have it's check engine light turn on for evaporative emissions errors (441,442,446). I've read the codes using the Autozone code reader and did the battery disconnect to reset the CEL. It's back again and she's bugging me about it. She swears she shuts the gas cap tight. Is this something we can ignore? SUV runs fine. Gas mileage is fine. The local dealer is a bit slippery... Background info: car bought used at 30,000 from Toyota dealer. Advertise as Dealer/Toyota owned and serviced car (could be malarky from the dealer and just a off-lease/trade-in). Current mileage 40,000. Primarily city miles. I've seen some scuttlebutt on the web about Toyota emissions systems. Any thoughts or opinions out there? Thanks!