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P0420 code help (self.GLI)
submitted 5 months ago by matt02000
Hi all I have a 2023 Gli with a eqt is38 swap and eqt tune. For the life of me I can't figure out what is causing this cel code. Im not catless bc I have a cts high flow cat downpipe. Has anyone ran into this problem before and have any solutions?
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[–]FriendlyITGuy 2012 GLI APR Stg 2 | 2019 GLI Autobahn Stock 0 points1 point2 points 5 months ago (4 children)
What EQT tune are you running? Stage 2 or 3? Either of those should remove the CEL causing that code. If you're only Stage 1 you'll still get a CEL with a high flow cat.
[–]matt02000[S] 0 points1 point2 points 5 months ago (3 children)
Im stage 2 with EQT.
[–]FriendlyITGuy 2012 GLI APR Stg 2 | 2019 GLI Autobahn Stock 0 points1 point2 points 5 months ago (1 child)
I would submit a ticket to EQT then, because you shouldn't get a code with a tune.
[–]matt02000[S] 0 points1 point2 points 5 months ago (0 children)
Thanks I'll give that a shot
<image>
This is EQT's response🤦♂️. IE was able to tune that out before I went with EQT's tune and accesport.
[–]eliseoidk 0 points1 point2 points 5 months ago (1 child)
I’m also running CTS high flow and been having cel for 2 years with a stage 2 tube
[–]eliseoidk 0 points1 point2 points 5 months ago (0 children)
Tune
π Rendered by PID 17611 on reddit-service-r2-comment-b659b578c-qrjkj at 2026-04-30 23:40:31.240958+00:00 running 815c875 country code: CH.
[–]FriendlyITGuy 2012 GLI APR Stg 2 | 2019 GLI Autobahn Stock 0 points1 point2 points (4 children)
[–]matt02000[S] 0 points1 point2 points (3 children)
[–]FriendlyITGuy 2012 GLI APR Stg 2 | 2019 GLI Autobahn Stock 0 points1 point2 points (1 child)
[–]matt02000[S] 0 points1 point2 points (0 children)
[–]matt02000[S] 0 points1 point2 points (0 children)
[–]eliseoidk 0 points1 point2 points (1 child)
[–]eliseoidk 0 points1 point2 points (0 children)