1991 Ford Mustang problems & reliability
77 owner complaints filed with NHTSA for the 1991 Ford Mustang. Last verified Aug 7, 2026. Complaints are unverified reports submitted by owners to the federal Office of Defects Investigation.
Each complaint is counted once (by NHTSA case number), even when it names several vehicles.
2 complaints report injuries (3 injured).
Federal crash records (FARS 2020–2023): 1991 Ford Mustang vehicles were involved in 6 fatal crashes with 3 occupant deaths. Involvement counts are not adjusted for how many are on the road and do not imply fault or a vehicle defect.
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Electrical System → | 31 | 40% |
| Power Train | 9 | 12% |
| Air Bags | 7 | 9% |
| Engine and Engine Cooling | 6 | 8% |
| Seats | 4 | 5% |
| Exterior Lighting | 3 | 4% |
| Seat Belts | 3 | 4% |
| Service Brakes, Hydraulic | 3 | 4% |
| Fuel System, Gasoline | 2 | 3% |
| Fuel System, Other | 2 | 3% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
Complaints by incident year
What owners report
“Tl* the contact owns a 1991 ford mustang. The contact stated that the independent mechanic notified him that the ignition switch had caught on fire, after the vehicle was parked and repairs were completed to the vehicle. The contact stated that the independent mechanic had replaced the fuel pump, fuel injector, air…”
Electrical System · filed Mar 4, 2020
“The airbags could deploy at an inappropriate time or not at all due to this problem the air bag blinks all the time and the manufacturer has no answers so I am red flagging this problem thank you”
Electrical System · filed Jun 24, 2015
“Tl* the contact owns a 1991 ford mustang. The contact stated that while the vehicle was parked, the contact noticed smoke and then fire from the dash board. The contact called the fire department and personally extinguished the fire. The fire department stated the fire was started due to an electrical component. The…”
Electrical System · filed Apr 16, 2013
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Federal defect investigations
- FUEL LINE ROUTING
Preliminary Evaluation PE94010 · opened Feb 2, 1994 · closed Apr 19, 1994
- HOOD LATCH FAILURES
Preliminary Evaluation PE91137 · opened Oct 9, 1991 · closed Feb 27, 1992
Technical service bulletins
35 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 1991 Ford Mustang. The 10 most recent:
Information regarding transmission fluid usage charts. *slc
01157 · Service Bulletin/Repair Instructions · issued Aug 6, 2001
Some vehicles may exhibit heater core leaks. *slc
01156 · Service Bulletin/Repair Instructions · issued Aug 6, 2001
Some vehicles may exhibit a vibration that may be heard of felt at the clutch pedal between idle and 2300 rpm, and goes away when depressing the clutch at least 25mm. *tt
00241 · Service Bulletin/Repair Instructions · issued Nov 27, 2000
Subject regarding contamination from prior transmission concerns or excess wear may be trapped in the transmission fluid cooling system. *tt
002310 · Service Bulletin/Repair Instructions · issued Nov 13, 2000
Information regarding the new transmission cooler flusher- service tip. *mjs
0015 · Service Bulletin/Repair Instructions · issued Jan 10, 2000
Subject on a wire harness terminal repair kit available for repairing electrical wiring harnesses. *tt
99222 · Service Bulletin/Repair Instructions · issued Oct 18, 1999
Information on identifying non-approved / alternate refrigerants which could cause safety, and performance concerns if installed in ford a/c systems. *tt
99196 · Service Bulletin/Repair Instructions · issued Sep 20, 1999
Information on the new flush and fill tool available through rotunda. *tt
99152 · Service Bulletin/Repair Instructions · issued Jul 26, 1999
Experiencing a whine / buzz type noise in the speakers of the entertainment radio or two-way radio on vehicles with an in-tank electric fuel pump. *tt
99129 · Service Bulletin/Repair Instructions · issued Jun 14, 1999
Ford motor company now recommends sae 5w-30 viscosity grade for servicing any ford gasoline-powered vehicle regardless of model year. *tt
99816 · Service Bulletin/Repair Instructions · issued May 3, 1999
TSBs are repair guidance manufacturers send to dealers — they are not recalls and repairs are not automatically free. Full documents are available on NHTSA’s site.
Safety recalls
No NHTSA recall campaigns name the 1991 Ford Mustang in our current data. Recalls may apply only to certain VIN ranges — always confirm with a VIN check.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →Buying a used 1991 Ford Mustang?
- · Decode the seller’s VIN with our free VIN decoder to confirm the exact year, engine and trim.
- · Check for unrepaired recalls by VIN on NHTSA’s official lookup — recall repairs are free.