Replacing components without making any dignostics to confirm if it is the cause can be a waste of money and time.
Is the MIL indicating?
Most parts stores provides free scanning services so if you could get the vehicle them, you most probably can et the codes read.
If it is a fault with the ECT, you need to check if it is the sensor itself or wiring circuit. A sensor fault would be rectified when the sensor is replaced.
In one my previous post the link shows you what to look for when engine fails to restart. Go through them and see what is missing.
Which engine do you have?
Friday, April 20th, 2012 AT 3:17 PM