Vios high fuel consumption starting issue

Sounds familiar! I have a Vios too, and had similar problems a while back. High fuel consumption and poor starting are classic signs. Have you checked the engine throttle or the throttle position? For me, it was like trying to run with a clogged nose - the engine just couldn't breathe right!

Engine throttle, you say? How do I even check that? Is it something a newbie like me can handle, or am I better off taking it to a workshop? Maybe I should start with the accelerator pedal module?

Honestly, unless you're comfortable poking around, I'd suggest a workshop. In my case, it turned out to be a defective accelerator pedal module messing with the engine idle. Cost me around 205€ to get it sorted. Better safe than sorry, right?

Thanks a lot! Seems like that might be the problem. I'll take it to a shop and mention the accelerator pedal module. Hopefully, that's it. It was indeed! Defective accelerator pedal module, 205€! Runs great now!