Mercury Repair Questions? Ask a Mechanic for Answers ASAP
Is the check engine light coming on when the speedometer stops working?
If the check engine light comes on when the speedometer stops working the problem could be a bad speed sensor but to be sure you should have the system scanned when the light is on as it will have a stored code. Most auto parts stores will do the scan at no cost to you, once you have the code we can direct you in the needed repair.