[Sparch]

Need some experienced guidance

- DME active codes -
180001 - Catalytic converter: Efficiency too low.
21B28A - Info SGR48: Voltage at KL40: Undervoltage.

I installed the AA Catted DP back in beginning of December. I saw the above code (180001) but never got any CEL till today.

Now first time seeing the 21B28A undervoltage code today and CEL popped up.

Does anyone know what this new code is?

The only other mod I installed was MButtons from IAW and am wondering if that might be a factor? That was installed just before Christmas, so it has been in the car for a full month.



Trying to figure out also if I should remove both before taking the car to the dealership if I need them for resolution?