I would ask the salesperson you bought the car from. And if stopped by the police, I'd refer him to the salesman / showroom office I bought the car from. Why should you go through extra trouble at your own expense?

/Unless the said salesman does not entertain your concerns post sale - but then (although almost non-existent here) you can try to press for proper customer service, saying something like he will lose repeat business, not to mention your recommendation to your friends for additional business, etc.