P0420

21wrx88 · 2023-03-18T01:35:00-0400

Hello all! I have a 2021 wrx with 20k miles.
I got cel P0420
AFR is at 14.7 while driving.
I have a Grimspeed v2 gesi catted j pipe, remark catback as well. I’ve had Jpipe installed for about 3 months and exhaust for a year or so. Car is pro tuned at the moment. Any idea what it could be before I spend unnecessary money. Thanks.

Maximus1991 · 2023-03-18T07:13:38-0400

21wrx88 said:
Hello all! I have a 2021 wrx with 20k miles.
I got cel P0420
AFR is at 14.7 while driving.
I have a Grimspeed v2 gesi catted j pipe, remark catback as well. I’ve had Jpipe installed for about 3 months and exhaust for a year or so. Car is pro tuned at the moment. Any idea what it could be before I spend unnecessary money. Thanks.

Are not EGR causing trouble when modded? I remember my tuner tell me at least twice about removing the egr; Not necessarly a answer for you but oh well

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21wrx88 · 2023-03-18T10:34:11-0400

Maximus1991 said:
Are not EGR causing trouble when modded? I remember my tuner tell me at least twice about removing the egr; Not necessarly a answer for you but oh well

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I mean if deleting my egr fixes the problem I might as well do that.

XJman · 2023-03-18T11:30:31-0400

21wrx88 said:
I mean if deleting my egr fixes the problem I might as well do that.

Egr won't likely fix the issue.

If they tuned via Cobb, and recently that code will remain from what I understand. The sensor can't be disabled.

21wrx88 · 2023-03-18T12:32:19-0400

XJman said:
Egr won't likely fix the issue.

If they tuned via Cobb, and recently that code will remain from what I understand. The sensor can't be disabled.

That makes sense, I will go back to my tuner and have him take a look and see what he can do.

clt-wrx · 2023-03-18T14:51:14-0400

Do you have an update on this?

21wrx88 · 2023-03-18T16:06:05-0400

clt-wrx said:
Do you have an update on this?

No not yet, I will be taking my car over to my tuner and see what happens. I’ll keep everyone posted.

21wrx88 · 2023-03-18T16:08:30-0400

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This is pretty helpful, the ap shows you what it could be.

XJman · 2023-03-18T16:41:52-0400

21wrx88 said:
View attachment 334729
This is pretty helpful, the ap shows you what it could be.

It is, but it may be irrelevant considering the custom tune and the state of your exhaust

P0420

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