The starter is located at the front of the engine (front of the car).
Look at the engine from underneath, just behind the radiator - follow the heavy gauge black wire to the starter itself.
The first clue would be if the car doesn't turn over :)
According to the 2002 Mercury Sable Owner Guide : ( the 6 disc C.D. changer is either located in the center console , the trunk , or the right side of the cargo area , that would be for the wagon version )
The 1995 Mercury Sable would have come from the factory with ( 5W-30 ) oil in the engines
i think i had the same problem in my 97 mercury sable ,,,mine turned out to be a transmission problem. .i would also check fuel filter ,,its located in the lower rear quarter panel
Probably , there would be a fuse box in the passenger compartment and a Power Distribution Box ( which is " live " ) located in the engine compartment
Check under the hood by the right shock absorber tower or along the frame rail under the car towards to rear
Could be a bad inertia switch.
how much would it cost on a 2004 mercury sable
On a 2000 Mercury Sable : The automatic transaxle ( transmission ) fluid level dipstick would be near the firewall just to the drivers side of the engine ( where the transaxle is bolted to the engine )
Replace your transmission pump or get a new transmission.
check all your ground wires
Fuel leak at hose or fitting Carbon canister is exhausted