I think what the op means is a cel or "check engine light" ?
Iirc there was some work done in the firmware for one but don't recall if it was finished it not.
Quantum Coupe with V04 on Ford 1.4CVH,Quantum 2+2 with Custom V04 on Jaguar 3.0l AJ30 V6
mini GPIO :done More soon
CANbus broadcast interface: done
Simple sd logger :done
External CAN io: Inputs :done
Gearbox controller: working