Easy get an oil change at a garage and have them erase the code or do the oil change your self and then disconnect the neg battery terminal. Easier : On the console, where the oil change light is on, scroll through the items until you get to oil life. Once at oil life, hold the reset button and it will say Engine oil new? Press reset again and this should set you oil life back to 100% without needing to disconnect your battery
Complete
1- Turn on the ignition without starting the car
2- You will get warning messages on the display (including the "change oil soon" or "oil change required" message) press reset for each warning till you get the Odometer displayed.
3- press the setup button until "press reset for system check" appears
4- hit the reset button (need to do this fairly quickly, if you end up back at the odometer go back to step 3)
5- the system will scroll through the different things that are wrong that it has detected, you should go to "oil life XX%, Hold Rest New" message first if nothing else more major has been detected. When on this message hold the reset down unit you get the message "if new oil hold reset".
6 - hold the reset down till the message "oil life set to 100%" appears (note have seen different wording in some models)
7 - system should scroll through any remaining messages and then return to the odometer reading
Switch the car off and on and confirm that the message does not reappear. Have seen some instances where will not reset, if so take to your dealer.
I had the same problem on my 2002 Ford Explorer, after I replaced the gas cap the light turned off
On a 1997 Mercury Mountaineer : The " CHECK ENGINE " warning light is just to the left of the battery voltage gauge
had to replace the battery in my 2002 Mercury Mountaineer but now the theft light is blinking, it is cranking up. How can I stop it?
od light flashing on 1997 mercury montoneer
To reset the service engine soon light on a 2006 Mercury Mountaineer, you can buy a scan tool. Make sure you note down the numbers before scanning.
An ABS fault.
According to the 2002 Mercury Mountaineer Owner Guide : ( fuse # 24 is a 15 amp fuse for the cigarette lighter and OBD II )
Because your switch is bad, replace the light assembly
The check " gage " light on in your 1997 Mercury Mountaineer indicates that either your engine oil pressure is LOW , your engine temperature is HIGH or your gas tank is AT OR NEAR EMPTY .
An engine misfire has been detected
spray your door latches with wd40.
I had the same problem with my 2002 ford explorer in 2008. I took my vehicle to the dealership and ended up having to have my torque converter which is inside of the transmission replaced. Yes it was costly!