There isn't a fuse for it. That'll be powered... for that model year, it'll be powered by the engine ECM (newer ones will be powered off the dash cluster module). So you can't just pull a fuse and disable it. But if you're trying to pass emissions, it wouldn't work anyhow.
If your check engine light is blinking that means an engine cylinder misfire has been detected - have the vehicle scanned for any trouble code(s) to help diagnose and then repair the problem
You have the code read with a scan tool to determine which cylinder.
You must scan the computer to find out the code first Go to a qualified mechanic for a diagnostic
The check engine light would illuminate and set a code for the bad O2 sensor.
Fuel filter
If the check engine light is flashing with the engine running that means that an engine cylinder misfire has been detected . You can still drive it in for repair , just avoid any rapid acceleration or deceleration because you can damage the catalytic converter
On a 2001 Mercury Sable : That's your " CHECK TRANSAXLE " ( transmission ) warning light The warning light is located in the bottom of the tachometer on the left side . If the light stays on take the vehicle in for servicing
The most common cause of a dome light staying on in a Mercury Sable is electrical issues. If a fuse becomes disconnected or is loose this can cause the light to remain on. Check the dimmer switch and the plunger switches in the door jambs.
On a 1998 Mercury Sable : The " Service Engine Soon " light is the same as a " Check Engine " light Something is effecting the engine emission controls It might go out by itself or if it doesn't and you have used the vehicle a few times ( from a cold start ) and have topped up the gas tank since you first noticed the warning light , then you should have the vehicle scanned for any trouble codes to help diagnose and repair the problem ( P.S. I'm not a mechanic / technician )
On a 1997 Mercury Mountaineer : The " CHECK ENGINE " warning light is just to the left of the battery voltage gauge
Check and fix the engine.
If your check engine light is flashing , an engine cylinder misfire has been detected