There is a good chance it is an emission problem.
multiple reason. you need a scanner to find out what the code is that turned the light on. auto zone does this for free.
Get the codes using a scanner
There can be several causes for the service emissions systems light to come on in a Ford Escape. The light can indicate an 02 sensor is out or it can indicate an exhaust leak.
Have vehicle scanned to determine the problem
you could have a leaky or damaged transfer case.
A service engine light can come on for many reasons. Someone can take the vehicle to the dealership or auto parts store to have them read the code and let them know what the issue is.
you should have your engine checked out to make sure everything is working well
Get the computer scanned to see what the problem is.
That is one of many possible causes.
you have a looose connection in dash..behind cluster..
Replace your ECTS. Get the SES codes
There are pages and pages and items that can cause a check engine light. You need to have it checked for codes with a scan tool.