How do you know if you need a speed sensor for a 02 Mercury Cougar?

You may need a speed sensor for your 2002 Mercury Cougar if you experience issues such as erratic speedometer readings, the speedometer not working at all, or transmission shifting problems. Additionally, if the check engine light is illuminated and diagnostic trouble codes related to the vehicle speed sensor are present, it could indicate a malfunction. A visual inspection of the sensor for damage or disconnection can also help determine if replacement is necessary.