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Service bulletins for the 1991 Mercury Grand Marquis

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

40 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

Bulletins, newest first
962211997-06-17. Service bulletin. VISIBILITY:WINDSHIELD. WINDSHIELD AND INTERIOR GLASS - FOG/FILM. *TW
962491997-06-17. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:TORQUE CONVERTER. TORQUE CONVERTER - LEAK TEST PROCEDURE - SERVICE TIP. *TW
962461997-06-17. Service bulletin. ELECTRICAL SYSTEM:WIRING. WIRING - ELECTRICAL DIODE IDENTIFICATION AND SERVICE REPLACEMENTS. *TW
BC96959610011997-05-27. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. ELECTRONIC AUTOMATIC TEMPERATURE CONTROL (EATC) INVALID DIAGNOSTIC CODES U1235 & 155 MAY BE STORED IF THE IGNITION SWITCH IS CYCLED FROM 'OFF' TO 'RUN' EXTREMELY SLOWLY. *TT
BC96429610011997-04-24. Service bulletin. POWER TRAIN:MANUAL TRANSMISSION. PROCEDURE FOR VEHICLES EQUIPPED WITH AN AODE OR 4R70W TRANSMISSION HAS A CONCERN OF SHUDDER FROM THE TRANSMISSION TORQUE CONVERTER CLUTCH IN 3RD OR 4TH GEAR OR DURING 3-4 SHIFT. *TT
BC51909610011997-04-24. Service bulletin. ELECTRICAL SYSTEM:WIRING:INTERIOR/UNDER DASH. VEHICLES EXPERIENCING CHAFING ON THE 14401 WIRE HARNESS CAUSING THE ACCESSORY FUSES TO BECOME OPEN (PRIMARILY THE CIGAR FUSE). *TT
BC51839610011997-04-24. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE. AN OIL LEAK IN THE AREA OF THE ENGINE OIL FILTER MAY BE CAUSED BY A DAMAGED OR MIS-INSTALLED (I.E. ROLLED OVER, PINCHED, SHEARED, NICKED, ETC.) OIL PUMP BODY SEAL. *TT
952121996-04-25. Service bulletin. SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP. THE USE OF PETROLEUM-BASED GREASE AS A LUBRICANT IN SERVICING DISC BRAKES IS NO LONGER ACCEPTABLE BECAUSE IT MAY BE INCOMPATIBLE WITH THE RUBBER MATERIAL USED IN THE DISC BRAKE SYSTEM. IF PETROLEUM-BASED GREASE IS USED TO LUBRICATE ANY PART OF THE DISC BRAKE SYSTEM, IT COULD CAUSE RUBBER PARTS TO SWELL IF LUBRICANT CONTACTS THE RUBBER MATERIAL.
BC30329504011995-11-01. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:TORQUE CONVERTER; SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC; ENGINE AND ENGINE COOLING:ENGINE; POWER TRAIN:AUTOMATIC TRANSMISSION; EXTERIOR LIGHTING:HEADLIGHTS; ELECTRICAL SYSTEM:IGNITION:MODULE; STRUCTURE:BODY:DOOR. UNKNOWN
95821995-11-01. Service bulletin. VISIBILITY:WINDSHIELD WIPER/WASHER:MOTOR; ENGINE AND ENGINE COOLING:ENGINE:GASOLINE. A REVISED SERVICE WINDSHIELD WIPER MOTOR IS NOW AVAILABLE. *TW
95681995-11-01. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. REVISED OIL PAN GASKET. *TW
95621995-11-01. Service bulletin. SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC. ROUGHNESS CONCERN DURING BRAKE APPLICATION. *TW
95461995-11-01. Service bulletin. VISIBILITY:WINDSHIELD WIPER/WASHER:MOTOR. WIPER MOTOR REPLACEMENT - UPGRADED SERVICE KITS. *TW
95461995-03-31. Service bulletin. VISIBILITY:WINDSHIELD WIPER/WASHER:MOTOR. REVISED WIPER MOTOR. *TW
95231995-03-17. Service bulletin. FUEL SYSTEM, GASOLINE. ERRATIC DISTANCE-TO-EMPTY AND FUEL GAUGE READINGS. *TW

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.