Reliability, what owners report, and what it costs to keep.
AVOIR's read: a solid ownership case with specific caveats below.
Owners have filed 45 complaints with NHTSA about the 1991 Hyundai Sonata, and it carries 1 recall. These are owner allegations rather than confirmed defects, but the pattern of what people complain about is the most useful signal a used buyer has.
| Area | Complaints | Share |
|---|---|---|
| Seat belts | 10 | 22% |
| Electrical system | 8 | 18% |
| Engine and engine cooling | 8 | 18% |
| Power train | 7 | 16% |
| Service brakes | 3 | 7% |
| Unknown or other | 2 | 4% |
| Air bags | 1 | 2% |
| Engine and engine cooling | 1 | 2% |
| Steering | 1 | 2% |
| Visibility | 1 | 2% |
Verbatim from NHTSA complaint records, trimmed for length.
LTR EXPRESSING HIS DISSATISFACTION WITH THE WAY NHTSA PROCESSED HIS PETITION FOR A HEARING...*MR THE CONSUMER SENT A PETITION FOR DEFECTIVE AIRBAGS. *TS. THE CONSUMER STATED THE AIR BAG RECALL WAS PERFORMED ON THE VEHICL
NHTSA complaint: Air bags
RECALL 93 V 196 000/PASSIVE RESTRAINT BELTS: SHOULDER BELT ON DRIVER'S SIDE HAS STOP TRACKING AND BECAME INOPERATIVE. DEALER AND MANUFACTURER WERE NOTIFIED, AND INFORMED CONSUMER THAT VEHICLE WAS NOT COVERED UNDER RECALL
NHTSA complaint: Seat belts
INTERIOR SYSTEM PASSIVE RESTRAINT BELTS FAILED, PRIOR TO RECALL NO #93V196000.*ET
NHTSA complaint: Seat belts
TRANSMISSION HAS FAILED 3 TIMES SINCE OWNERSHIP! TRANSMISSION IS SLIPPING, CONDITION WORSENS WITH COLD WEATHER.*AK
NHTSA complaint: Power train
WHILE DRIVING AT 45 MPH TRANSMISSION BLEW OUT, CAUSING THE VEHICLE TO SLOW DOWN, AND KEEP CHANGING INTO DIFFERENT GEARS. VEHICLE HAS BEEN IN THE REPAIR SHOP THREE TIMES FOR TRANSMISSION FAILURE. *AK.
NHTSA complaint: Service brakes
WHEN DRIVING AT ANY SPEED WITHOUT ANY PRIOR WARNING THE ENGINE CHECK LIGHT CAME ON AND WILL NOT GO OFF. ALSO, ENGINE/TRANSMISSION LEAK. CONSUMER HAVE BEEN HAVING PROBLEMS EVERY SINCE DAY ONE. *AK
NHTSA complaint: Engine and engine cooling
DRIVER NOTICED SMOKE COMING FROM CAR, TURNED OFF IGNITION, RESTARTED THE CAR AND THE KEY GOT STUCK IN THE IGNITION AND WOULD NOT TURN. A FEW MINUTES LATER, THE CAR CAUGHT ON FIRE IN THE ENGINE COMPARTMENT. OWNER WAS ABLE
NHTSA complaint: Electrical system
COMPLETE TRANSMISSION FAILURE, CAUSING FLUID TO LEAK ALL OVER EXHAUST SYSTEM CREATING SMOKE AND SMALL FIRE.
NHTSA complaint: Power train
NHTSA lists 1 recall campaign for the 1991 Hyundai Sonata. Recalls are free to have fixed at a franchised dealer regardless of who owns the car now, but only if they were never done, so check the VIN of the specific car rather than trusting the model.
THE MOTORIZED SHOULDER BELT CAN TRAVEL SLOWLY OR CHATTER IN THE TRACK AND MAY EVENTUALLY STOP TRACKING AND BECOME INOPERATIVE.
Risk: SLOWING, CHATTERING, OR FAILURE OF THE MOTORIZED SHOULDERBELT MAY DISCOURAGE USE OF THE RESTRAINT SYSTEM, INCREASING THE RISK OF INJURYIN THE EVENT OF A SUDDEN STOP OR ACCIDENT.
Fix: DEALERS WILL LUBRICATE THE TRACK ASSEMBLY AND, IF ANY SYSTEMS ARE FOUND INOPERATIVE, THE SYSTEM WILL BE REPAIRED OR REPLACED, AS REQUIRED.
| Reliability raw | 91 | excellent |
|---|---|---|
| Longevity est. | 84 | excellent |
| Maintenance | 84 | excellent |
| Depreciation | 69 | good |
| Performance | 49 | below average |
| Efficiency | 40 | below average |
Percentile ranks against other midsize & large cars in the catalog.
What stands behind each score for this car:
Owners have filed 45 complaints with NHTSA for this model-year, and seat belts is the most reported area with 10 of them (22%). There is 1 recall on record. Check any specific car against its VIN before buying.
AVOIR scores its reliability 91/100 (excellent) from NHTSA recall campaigns and complaint density. That figure is a raw complaint count, not yet adjusted for sales volume, so a high-volume model scores worse than it deserves.
AVOIR scores its longevity 84/100, but that figure is an estimate built from the powertrain and the brand's record, not a measurement. A 1991 car has no 200,000-mile population to observe yet, so treat it as a prior rather than evidence.
AVOIR's read: worth a look, because a solid ownership case with specific caveats below. Its overall ownership score is 76/100. Condition, mileage and service history still matter more than any score, so get a pre-purchase inspection on the specific car.
Sources: NHTSA recalls and complaints, EPA fuel economy, IIHS awards, and live market listings. A score describes a model-year, not the individual car in front of you. Get a pre-purchase inspection.