Diagnosing engine warning light

[Bristalphard]

Hello - The orange engine warning light on my 2005 Alphard is showing and I'm having difficulty finding a local mechanic/garage who can diagnose the problem. Toyota dealers say they can't help as it's an import. I'm hoping somebody on here might know of someone in the Bristol area who can check it out. Vehicle is a 3L V6 and running fine otherwise, there's a rush of air when the petrol cap is removed, and the dash light is not flashing. Any advice greatly appreciated.  

[Alfie]

Could try Bristol based hallen imports, now called funky ram for some reason!