P0420

[ORRadtech]

I've searched and don't see anything related for a stock car.
2018 Ecoboost 72k miles, completely stock. CEL came on yesterday showing P0420 Bank 1 catalyst efficiency below threshold.
It's had a bit of a rough idle lately but otherwise is behaving normally. I only run 93 but, due to the pipeline thing, had to put one tank of 87 in it two tanks ago.
From what I've read it is most likely either the cat or the O2 sensor(s). 72k seems early to me for either to be bad but??? On the live data the O2 sensors seem to be cycling between 0.98v and 0.14v which is what I thought they are supposed to do.
My current thought is to run a bottle of CAT cleaner through in before I start swapping parts. Then O2 sensors and hope it doesn't come to getting a CAT, those things are pricey.

Am I on the right track? Any thoughts or experience with P0420?

Thanks

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[Twizzty]

I thought CATs have an 8 year/80k mile warranty from Ford, might want to check on that.

 

[ORRadtech]

I didn't realize that. Thank you.

 

[Cobra Jet]

I thought CATs have an 8 year/80k mile warranty from Ford, might want to check on that.

Go here, pages 17-31 covers all Emissions Related Warranty Coverage:

https://www.ford.com/cmslibs/conten...ck-Warranty-version-3_frdwa_EN-US_08_2017.pdf

 

[ORRadtech]

Thanks. The way I read that is it should be covered under warranty whether it's the sensors or the cat of pretty much anything else that would cause that code.
I'll give Ford a call to schedule an appointment. Even if they claim it's not covered I'll at least get a dx and not have to throw parts at it...

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