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most odometer will need be repair by expert who cal odometer or replace the total meter
If the speedometer works, but the odometer is not working, there could be a fuse blown if the odometer is digital. If the odometer is not digital, then a gear is broken in the speedometer cable. It should be replaced.
Check the speed sensor.
by licking stuff
The door lock, on your 1999 Mercury cougar, can be replaced by removing the inside door panel. The locking mechanism is easily visible and can be changed.
Replace the instrument cluster.
Go to this site and contact these folks. If they cant help, they might be able to point you in the right direction. http://www.dashusa.com/ford_trucks.htm Run1
Check and fix the engine.
clean out the MAF sensor with some alcohol
Chain and it is a very (~1000.00) costly fix.
There is no way to fix a catalytic converter for a 1987 Mercury Cougar, since it is a sealed and unrepairable item. Once it goes bad, you must jack up the car, unbolt the old converter, then put a new one in its place and bolt it in.
Follow the troubleshooting tree that is associated with that code.