code

anyone got history with these? troubled area both point to ecu but also map sensor and air intake. http://www.toyotagtturbo.com/forums/showwiki.php?title=EFI+self-diagnosis+system where should i start with this?

Hi guys, Hopefully someone can help me with this. I have a fault code 42 showing up when I do a diagnostic. The Engine Management Light comes on after 70Mph/120kmh. My speedo is working perfect so i dont know what else it could be? Regards.