I too have the p0420 issue I have a 2015 sti with ots stage one from cobb via accessport and a cobb catback It's only with a recent etune, i've had the j pipe (gs) with associated etune for over a year.
Nissan Code P0420 Bank 1 Easy Fix Guide - Car Mechan
I have a 2015 wrx with 140k on it
I tried replacing both bank 1 and bank 2 o2
The p0420 code is a generic powertrain code that indicates a problem with the catalytic converter in the exhaust. The subaru p0420 code looks scary, but it’s solvable with methodical diagnosis Works fine but it is throwing engine code p04db. The most common fix for p0420 in the subaru wrx is a new catalytic converter, followed by an o2 sensor.
Told my tuner i kept running rich and that i got a p0420 code now and his response below “regarding the grimmspeed jpipe, it's. I will share with you how i fixed my p0420 code I must disclaim, this may not fix your code but it’s a cheap alternative.
What is the p0420 code
The p0420 code is a generic powertrain code that indicates a problem with the catalytic. I have a p0420 on my 2015 wrx with 131k miles and here is what i've done so. My daily driver 2019 wrx sti has 65k miles and is bone stock It recently threw a cel for p0420, catalyst system efficiency below.
In 2021, i had a lot of fun working to track down a p0420 code As a result of this, i found several other issues. Help p0420 code i have a 2018 sti w/ 25,000 miles and i have a cobb downpipe and cobb titanium catback installed Enjoy the videos and music you love, upload original content, and share it all with friends,.
2020 wrx sti w/ tomei catback
No other mods done but that Did the rear differential and transmission oil change at 52k However, after doing so, p0420 (catalyst system efficiency below threshold) started appearing Hi there, new to the forum
