With a reader. You can get one at an Auto Parts store.
12 and 13 are idle speed controller malfunctions. 74 indicates that the brake pedal was pushed while reading the codes.
possibly a blown fuse.
Follow the + battery cable - should either be in the inner fender or on top of the starter
Fuel pump is located in the trunk on the left side you have to remove the interior panel
take it to a good mechanic or a ford or merc dealer and they have to clear it for you
Could be a bad coil, plug, or injector. Start with the coil first.
Should be a label posted either on door jamb or on fuel cap filler door
Most likely, it is in the gas tank. Any local auto parts store can confirm this.
More than likely the gears are stripping on the door lock actuator and will soon fail to work.
your loosing idle pressure check your vacume lines ans throttle sensor
The crown vic is more popular its the same car basically but the merc is considered higher end the crown is cheaper to buy
Merc Clothing was created in 1967.