Lexus reported that some 2005-09 GX470 SUVs may turn on the Check Engine light and log one or more of the following EVAP system trouble codes in PCM memory: P0441, P0455 and P0456. One likely cause ...

What happens if my gas cap is left off? Why does it cause the check engine light to come on? Have I done some damage to the engine? These are very common questions, and luckily there's an easy fix ...

My local mechanic replaced the gas cap — it was very loose — and said the light would disappear after the car was driven for a while. He had first checked the computer and there was no code.