Please buy this:
https://www.amazon.com/KOBRA-OBDII-B...etooth+adapter
And this app:
https://torque-bhp.com/
And for less than $20 total you have a code reader always on hand on your smart phone, along with a ton of other data you may not have even known you wanted to know about your car and what it's doing at any given time. Keep the adapter in your glovebox, and any time the CEL turns on, you can know what the code is in a minute, easy as pie.
And knowing is half the battle...