CEL but no DTCs detected?
 

I'm seeing a permanent CEL on my dash, but upon doing a vehicle DTC scan via the EcuTek app, I don't see any codes displayed.

Oddly enough, performing the OBD readiness scan does show "1 emissions-related DTC" next to the CHECK ENGINE checkbox, but it doesn't provide me with any way to view it.

Any ideas on why I can't see the code? I cleared all DTCs just to see if it would come back, and nothing showed up after a 10 min cruise around town. I did check the gas cap :)

Powertrain mods on my car (2017 BRZ):
Delicious Stage 2 Tune
JDL Catless UEL Headers
Jackson Racing oil cooler

Tune related most likely.

Get a different scan tool or go to autozone and borrow one. I have a feeling its p0420 and it might be a tune issue

I sent a note to Delicious to see. Some quick Google fu tells me that's something to do with the O2 sensors?

Delicious probably forgot to turn off the emissions related codes in the tune.

Are you flex fuel with pressure sensor? Could be fuel pressure related to the D box.

Nope. Just regular 92.

If it's EcuTek tuned then it could be that the CEL is set to come on for some reason when a Custom Map is triggered. That will not pop a code. EcuTek is normally very good for viewing DTCs.