Hello to every one!

I need your help and advice.
We have a mitsubishi FD15NT truck.
On the meter panel indicates the F-36 error.
Everything is working fine.

I know that this error is for steering sensor, but which exactly??????
Sensor on the rear axel (right king pin side) or the sensor under the steering wheel (the sensor on the white box with directional (f-n-r) and light lever -but this one is a brand new part).

How to solve this error?
And it seems to me, that the front tires are worn out not proportionaly
The right front tire is worn out more than the left side - could this be also a bug that couses the error?
Thank you for your help!!!