I have an intermittent problem with the dash warning sensor lights. The CHECK ENGINE, COOLANT LEVEL, and EXTERIOR LIGHTS sensors come on. The dealer replaced the coolant sensor and the problem came back in a day. As soon as I turn the headlights on, the Light Fault sensor comes on. All the lights are okay and the coolant level is at Max and the coolant sensor was replaced with a new one.

What is the problem with my car?

Please advise,

John