What's up fellow G's, hope everyone is doing well.
I had a really quick question concerning the SES (Service engine soon) light on our cars. Mine just turned on randomly while cruising​ on the highway to get gas. Went to my mechanic and he pulled the code P0420, which is a bad catalytic converter on the passenger side (I think upon further research). Now , is this just my car telling me that too many fumes are being released from my exhaust therefore thinking that one of my cats is broken, when in reality I just have z1 HFC ?

And if that's the case, should I just restart the ECU ? Someone mentioned in another thread when I was searching that if I reset it and it comes back right away, that's when I should be concerned. If it doesn't come back, prob nothing to worry about. I also read that it could be my o2 sensors but I also read you get a different code for those while p0420 and p0430 indicate the actual driver / passenger side cats.

Last question is would be, does our car have a CEL or is our CEL light THE SES?
​
Exhaust setup: Ark Grip paired with Z1 HFC

THANKS

 

Ses=cel=hfc.
It happens.
Reset and forget it. It may or may not come back down the road. Repeat above. If it happens frequently then get a cel fix or it may indeed be bad.

 

^+1 I had this code pop up a few months ago when the temp was below zero. I reset it and it hasn't come back. BTW I am running Berk HFCs.