I had the ECT sensor changed. After it was changed the warning lights for the low coolant level, the temperature, and the check engine light came on even though the coolant levels were fine. I figured the plug for the ECT sensor was dirty so I replaced it. No change. The lights are still on. Any suggestions?

 

Get the codes read and post.

We'll sort out.

Likely a bad or incorrect sensor for the car or something in the wiring is causing the circuit to read too low a resistance such that the PCM is interpreting the situation as though the car is overheating.

What does the temperature gauge show?

Also, if you have a multimeter, remove the connector and measure the resistance between the two pins (takes a steady hand) of the sensor.

I have my guess.

Was it doing this as soon as you picked it up or did it start later?