To get your port injection firing, ensure you use the dedicated MOTIV Firmware Updater app rather than TunerPro to flash the Reflex+
Here is your checklist:
Match Your Serial Number: Check the back of your Reflex+ for your serial number, as Motiv has specific firmware files depending on the...
Your steering angle sensor (SAS) is likely out of calibration. When an alignment changes the thrust angle or wheel geometry, the SAS can lose its "zero-point," causing the VSC to panic and trigger phantom braking when the car is cornering off-center.
The GT350 fixes the weak, sloppy feel of the Mustang GT's MT-82 transmission with its track-focused Tremec manual gearbox. Owners who made the switch to the GT350 rave about its raw V8 sound and razor-sharp handling. However, the Supra is noticeably faster, far more comfortable to daily drive...
The 120308 and 120408 codes mean the DME detected a boost leak or deviation, causing it to shut down boost control as a safety measure. Since you are Stage 2 E40, the extra boost commonly pushes connections open even if they look completely fine at idle.
The "OBD error: general reject" usually means your ECU is locked or still in a diagnostic mode. First, restart the car completely. You can check the EcuTek app instructions on the https://ecutek.zendesk.com/hc/en-gb/articles/360020370437-PhoneFlash-Getting-Started Getting Started page.