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Recent P0430 Code on Mustang V6 2015

Moyocay

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Hi, last friday a CEL popped up. P0430 code (Only one). P0430 Catalyst System Efficiency Below Threshold (Bank 2). I have no mods (stock cats, no CAI, no headers), Ran only on stock Tune. Only "mod" is a Roush AxleBack. I cleared the code and added a "cat cleaner" additive. Today, the light & code popped up again.

I have no power loss, no rough idle, normal cold start, no milage change.

Any advice?
Thanks in advance
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Nagare

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Get your cats checked and if it's not that, one of your rear O2 sensors may be going out. Can't remember if that is passenger or driver side.
 
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Moyocay

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Get your cats checked and if it's not that, one of your rear O2 sensors may be going out. Can't remember if that is passenger or driver side.
Hi, it's driver's side downstream sensor. But i've heard that exhaust leaks may cause that CEL code to pop up. Would my axle-back (roush is a baffled straight through) count as a exhaust leak?
 

Nagare

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Hi, it's driver's side downstream sensor. But i've heard that exhaust leaks may cause that CEL code to pop up. Would my axle-back (roush is a baffled straight through) count as a exhaust leak?
It'd have to be a leak before the sensor though, something at the axles shouldn't trip that code at all.
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