Speedometer + airbag warning lamp voltage ..

Good day friends ..
In this cruise, which happened to me twice a day (arrival-departure), the km bar dropped down, and this was added to the event today by adding an "airbag" warning lamp. But this airbag alert got me a little scratched. You'll say, "Why don't you take it for repair?" In the last maintenance (timing, Swing, rot head etc.) I could not remove the entrant. so I will direct myself with the information I get from you until my hand is recovered. I hope the problem is not a big thing. Thank you to those who share their opinions and knowledge.

Something that happened to me is probably the speed sensor malfunction of the problem, it's not an expensive part in that part. It is not difficult to change, and if you have any other problems, you can change it at no extra cost.

Km-speed sensor as friend says

Will the speed sensor also affect the operation of the car? When this happens, its operation becomes abnormal. The vehicle contracts more than usual at low speed.

Replace the teacher speed sensor and look at the fault codes of the vehicle.