Simtek diagnostics

[Birty7810]

Hi everyone, having trouble with my car lately has been struggling to start in the cooler weather needed two attempts to get it to fire up, now it’s come to frosty weather it doesn’t want to start at all just turns over. Cars not standard running 416bhp, 750 injectors, Maffless 

i have the cable and simtek tuner software but not sure how you read any error codes or faults, anyone help with this? Just want to check it’s not a sensor gone wrong or something easy 

Tia