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The check engine light comes on and stays on when a problem is detected by the self diagnosis system of your vehicle.
Generally, a check engine light is lit when there is a problem in the emissions or somthing that is affecting the effectiveness of the emissions.
If the check engine light is flashing a misfire has been detected
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Check a starter for a 2000 Mercury Grand Marquis?
how to replace starter on 2000 mercury grand marquis
Where is the thermostat located on a 1990 Mercury Grand Marquis?
Check the engine end of the upper radiator hose
How do you turn off check engine light on a 1992 mercury grand marquis?
Have vehicle scanned to determine the problem
How 97 Mercury Grand Marquis spark plug gap?
On a 1997 Mercury Grand Marquis : Check the Vehicle Emission Control Information ( VECI ) decal in the front of the engine compartment , for the type of spark plug used and the spark plug gap
Could a 1998 mercury grand marquis be driven without a catalytic converter?
You can but the check engine light will remain on and it won't pass an emissions test.
How can you get cigarette lighter to work again in a 2000 Mercury Grand Marquis?
check the fuse
Mercury Grand Marquis check air suspension light is on?
I have a 1998 ford grand Marquis- and the problem is the air suspension light stays on- how to fix this problem
Where is the transmission level check stick on 1999 Mercury Grand Marquis?
under the hood, passenger side, between the engine and the fire wall. Look down.
Why does 99 mercury grand marquis run rough check engine light on?
The check engine light indicates that the computer has detected a "fault". Use a code scanner to find out what the computer has detected, that is PROBABLY the reason the engine is running poorly.
Your 1999 Mercury Grand Marquis wont catch spark to start.?
Check the ignition coil on the Marquis. Check the crank sensor as well. One of these is probably bad.
Why does your 1987 Mercury Grand Marquis crank but won't start?
First check spark, if you have, then check the fuel pump for pressure.
How do you replace the parking light bulb in a 2002 Mercury Grand Marquis?
check the bottom of the steering column
