This is a very common problem with Toyota cars if the amount of videos posted on YouTube is anything to go by. Have a look at them and you’ll get a good idea for a course of action or multiple actions. You can use an OBD tool if you access to one to reset your code and it will stay away for a while. It takes a certain amount of drive cycles for it to show again if you don’t do anything to fix it.
P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
in Corolla / Corolla Sportivo Club
Posted
This is a very common problem with Toyota cars if the amount of videos posted on YouTube is anything to go by. Have a look at them and you’ll get a good idea for a course of action or multiple actions. You can use an OBD tool if you access to one to reset your code and it will stay away for a while. It takes a certain amount of drive cycles for it to show again if you don’t do anything to fix it.