Check Engine light w/ 4,300Miles

[gerrygmendez2]

Looking for some insight. I purchased my first ever mustang back in October of 2023. Once I saw the new Dark Horse I fell in love with it. Since then on September 10 2024 @ 3200miles I had a Whipple Stage 2 Supercharger kit installed. Now in April 2025 @ 4000miles I have a check engine light w/ a P0430 code stored. I tried clearing the code but it reappeared after a few drive cycles. Looking at O2 sensor data proves that the catalytic converter is not working as it should. I took it to my local dealer and they denied a warranty claim due to the supercharger being installed. When I pressed them for data the technician stated fuel trims and a/f sensors are within spec. There is no Fuel/Coolant smell in the exhaust nor is there any drivability concerns. Has anyone else had this issue with a Whipple supercharger on the new S650 or did my vehicle come with defective catalytic converters?

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[broncoboy22]

I’ll let the more experienced folks chime in. But I believe it’s expected that stage 2 Whipple kit would blow through your stock cats. Contact Whipple and see what type of mods they recommend to fix it.

 

[Billycar11]

this is why i did stage 1
it is likely it blew apart the cats do you see white powdery residue in the exhaust tips like this:
https://www.mustang7g.com/forums/threads/smoke-at-startup-reving.164389/

sadly you do have no warranty in this case its very likely caused by the extra power

 

[ShadowCoyote]

Did you have your supercharger installed at a Ford dealer? I thought dealer installed whipples come with a 3/36 warranty.

 

[broncoboy22]

Did you have your supercharger installed at a Ford dealer? I thought dealer installed whipples come with a 3/36 warranty.

Only stage 1

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