My Yaris has an intermittent fault

[06YarisRS]

Originally Posted by Yarisprobs

I'm thinking it will more likely be something electrical due to not having any dash lights when this occurs.

Have contacted a dealership but they want to charge $130 an hour to diagnose the problem, considering this problem only occurs every couple to few weeks this would end up costing more than the car itself.

I interpreted "no dash lights on" as no trouble codes indicated by a engine MIL. Yes, it does sound like you have an electrical problem.