2003 Mercury Grand Marquis LS 8 Cyl 4.60L
Body & Interior
MILEAGE ODOMETER NOT WORKING
If both your odometer and speedometer are not working, then it's likely your speed sensor needs to be replaced. These are easily installed and located near the back of your transmission. If only your odometer is busted, then it's likely the gears that turn the odometer have broken. You need to pull instrument cluster to get at those gears, but it's not too bad to repair so long as you know what you're doing.