Need your help.

[4.6MustangGT]

My speedometer suddenly stops reading (not working), no check engine light and no codes too. Also the car dies whenever I hit the break to stop or slow down the speed, the RPM drops to zero and then the car dies.

The car was perfect before taking it to the dealer to check the reverse light problem.

Is it something to do with their checkup or it’s a new problem?

Thanks

 

[COramprat]

I'd just take it back to the dealer and asked them why they broke something else while in their care.