2021 Hyundai Sonata - Maintenance & Specs
The 2021 Hyundai Sonata belongs to a Hyundai Sonata lineup that Know Your Ride tracks across 25 model years, from 1989 to 2026. Engine options on record include the 1.6L Inline4, 2.0L, 1.6L. It is configured as front-wheel drive with an automatic (am-s6). The 2021 sits mid-run, with both earlier (1989) and later (2026) Sonata model years also documented.
It takes 0W-20 full synthetic oil, 4.2 qt with a new filter. Fluid specs on file include Long Life coolant, DOT 3 brake fluid, SP-IV transmission fluid. Know Your Ride lists 13 scheduled maintenance items for this vehicle, the earliest interval falling at 5,000 miles. Documented torque values include oil drain plug 26 ft-lb, lug nut 80 ft-lb, spark plug 18 ft-lb.
NHTSA complaints for this vehicle cluster around unknown or other (20), power train (12), engine (10). A representative report reads: "The contact owns a 2021 Hyundai Sonata. The contact stated while driving at an undisclosed speed, the engine shuddered and the engine stalled. In addition, the..." There are 4 safety recalls on record; one covers: Hyundai Motor America (Hyundai) is recalling certain 2020-2021 Santa Fe, 2021 Sonata, and Elantra vehicles. During manufacturing, the windshield may....
EPA fuel economy is rated at 45 city / 51 highway MPG, 47 MPG combined. Estimated annual fuel cost is about $950.
Quick Specs
| Oil viscosity | 0W-20 |
| Oil type | Full Synthetic |
| Oil capacity (w/ filter) | 4.2 qt |
| Oil filter | Hyundai 26300-35505 |
| EPA combined | 47 MPG |
| Tire size | 215/55R17 |
| Coolant | Long Life |
| NHTSA overall | 5 / 5 stars |
| Open recalls on record | 4 |
| Technical service bulletins | 85 |
Common Trouble Codes
- P0300 - Random/Multiple Cylinder Misfire Detected
- P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
- P0171 - System too Lean (Bank 1)
- P0128 - Insufficient Coolant Temperature for Stable Operation
- P0442 - Evaporative Emission Control System Leak Detected (small leak)
- P0455 - Evaporative Emission Control System Leak Detected (gross leak)
- P0700 - Transmission Control System Malfunction
- P0301 - Cylinder 1 Misfire Detected
- U0100 - Lost Communication With ECM/PCM A
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Part of the free Know Your Ride vehicle maintenance reference. Figures are sourced from EPA, NHTSA and manufacturer data and are for general reference - always confirm with your owner's manual.