HFC check engine light and tune

[Thats550mustang]

Im running ARH headers with the high flow cats and tuned through Lund. Well just yesterday I got the p0420 code and I emailed Lund about it. They said it’s a unfortunate thing that happens with high flow cats and they can’t delete the code. Are y’all running the little adapters and putting your o2 sensors in them? I’ve read a bunch of forums on this and a lot of guys are saying that’s the wrong way to do it. The tuner will delete those codes. Wellllll the tuner isn’t deleting those codes. Also is it possible for another tuner to look at your tune and edit it? I have a local mustang tuner and some of my buddies are tuned through him and he deletes the code.

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[Cory S]

Install metered rear 02 spacers......

Lund locks their tunes.

 

[Lbj]

I think a lot of people used these

http://www.bigdaddiesgarage.com/angled-cel-fix.html

 

[Cory S]

I use these. With NO cats.... Pass state OBD....

 

[Bluelightning]

Tuner can't delete the code as it would require them to turn off the rear 02.

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