Yaris acceleration problem

[WeeYari]

Originally Posted by myahya

It has the check engine light on ( but this has been on for years and I know I should have get it checked but it has been running fine , this has just started to happen few months ago).

This is a concern.

In another vehicle I had a check engine light caused by a faulty o2 sensor. Vehicle ran fine, but I was advised by several people to fix it as it would eventually lead to a fouled catalytic converter.

Ignoring a check engine light is never a good thing. Get that code checked asap.