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Old 09-27-2017, 04:21 AM   #1
ThinkPad
 
Drives: Yaris XP9 1.3 '06
Join Date: May 2016
Location: -
Posts: 33
P0420 error (Catalyst System Efficiency Below Threshold )

So,

Since a while we are seeing the check engine light pop up sometimes on our Yaris 2006 (1.3 engine 2SZ-FE) with manual transmission.

When connecting the OBD-reader, it sees a P0420 error, which stands for "Catalyst System Efficiency Below Threshold Bank 1".

I saw this for the first time about three months ago. Had some issues with the rear muffler, but that one was replaced for a original one by the dealer. New muffler sits under the car for about a month now, but i saw the P0420 again last week. I have resetted it and it will stay of for a few weeks/month.

However, what is the cause of this and how can i solve it more permanently?
I am afraid of replacing the catalytic converter, as that part is $$$$ expensive and i read that sometimes it won't even solve the problem as Toyota's are quite trigger happy for this P0420 error?

Is there someone who has dealt with this error before? Car runs fine otherwise, no issues. Mileage (see signature icon) is also fine.
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