Do you mean the knock sensor? It's a device that detects engine knock so that the computer can retard the timing. If the knock sensor isn't functioning, it could be a connector or the sensor.
common problem with 1998 mystique check engine light on
I have a 98 mystique, and when the check engine light comes on, I simply disconnect the positive battery terminal for a couple of minutes. When I replace it, the check engine light is cleared. It resets the computer.
If you're referring to the Ford Contour/Mercury Mystique, check sites such as eBay, Craigslist, local salvage yards, etc.
not charging the battery properly... check the alternator.
Is the auto insurance provider required to make your repair claim check to the repair shop?
If your check engine light is flashing , an engine cylinder misfire has been detected
Can be just a blown fuse, so check the fuse. The lighter itself can be defective or the outlet can be bad. Try a known good lighter from another car and see if it works. If so, your lighter is bad. If not, then check the fuse. If the fuse is good you know you have a wiring problem or the outlet is defective and must be replaced.
Take a continuity tester and check them. you'll find the bad one
Check the Auto Zone website it gives you detail infor How to do it
Their is no such thing as a free repair manual, Check with your local library and see if they have an auto repair manual that you can check out.
check your owner's manual
warning code check faults indicated by subsequent codes