Check engine warning light

[Ventora2]

I have a 2004 vxr Monaro with 64000 miles, warning light comes on every time I start up. It is becoming more frequent as I drive especially when pulling away when idling . I have spray cleaned the sensors in the air intake with no improvement. Anybody had this problem , car is running fine. Also what's the best obd2 app for this car as the ones I have tried say no issues.