The car wouldnt reverse on a slope or rev hard without giving power if the air filter is clogged. When was the last time you changed ATF oil?
I suspect the gearbox. The car is revving hard but moving slow because its not shifting gears. You need to show the car to a gearbox specialist and there is only one guy whos accepted by most members of this forum to sort gearbox issues. Chandana from Nilwala Motors 077 3027118
You should not be taking any chances with a CVT gear box. First check the condition of the CVT oil through a garage or a service joint and replace if necessary. You might need a tuneup too but first check whether the gear box is ok.
No this does not have an input from OBD port to get steering angel. And not as accurate as the one with 360 systems with dynamic guide lines. It has some motion sensor LEDs and trajectory is calculated based on the vehicle movement.