ASKED BY: 2000marquis 0 0 1 0 4 4 33 ASK DATE: Apr. 26, 2008 CATEGORY: Mechanical | Engine What Sensors That Need To Be Replaced? Vehicle: 2000 Mercury Grand Marquis Engine: V8 4.6 L Transmission: Automatic Drivetrain: RWD Current Mileage: 133000 I HEAR IT IS GOOD TO REPLACE BOTH OXYGEN SENSORS ON VEHICLES THAT HAVE MORE THAN 100000 MILES BEACAUSE THEY REDUCE GAS MILEAGE WHEN THEY GET OLD....IS THERE ANY OTHER SENSORS THAT AFFECT VEHICLE PERFORMANCE OR ECONOMY OTHER THAN OXYGEN SENSORS...(I MEAN SENSORS THAT HAVE A DIRECT EFFECT ON THE VEHICLE PERFORMANCE) AND WHAT ABOUT THE CATALYTIC CONVERTER..I HEAR THAT REPLACING IT WITH A NEW ONE WOULD INCREASE THE PERFORMANCE OF THE ENGINE SINCE THE CATALYTIC CONVERTER GET CARBON BUILD UP WITH AGE COMMENT BY: way2old 0 2 1 7 3 2 80 COMMENT DATE: Apr. 27, 8:55 AM QUALIFICATIONS: ASE Certified Site Rank: 2 Converters will not get carboned up if the engine has been running properly. Thet burn at such a high temperature the residue is ash and flows out the exhaust. All the sensors that affect fuel management, air intake and vehicle speed have a direct relationship to the fuel mileage and performance. You need to do a lot of testing and checking before replacing sensors. Unless you have really deep pockets and just want to replace them on a whim. Username: Password: Remember Me  Sign Up  Forgot Login? Month of July way2old Mech Rep: 80 Site Mileage: 21732 rschaefers Mech Rep: 73 Site Mileage: 6540 lking606 Mech Rep: 32 Site Mileage: 225 LLoydB Mech Rep: 32 Site Mileage: 216 antonz Mech Rep: 32 Site Mileage: 216 About Us | Contact Us | FAQ | Privacy Policy | Site Map Vehicle Aid © 2005-2008. All Rights Reserved.