Compare two new cars by price, estimated monthly payment, fuel economy, and other specifications. Data comes from the CarPayCheck.com catalog and uses your selected financing terms.
| 4 Series | K4 | |
|---|---|---|
| Manufacturer | BMW | Kia |
| Starting price | — | — |
| Monthly payment | — | — |
| Fuel type | Hybrid | Gasoline |
| Fuel economy | 29.0 mpg | 30.0 mpg |
| CO₂ emissions | 285 g/mi–320 g/mi | 267 g/mi–314 g/mi |
| Annual maintenance cost | — | — |
The most frequently reported issue is electrical system malfunctions, with complaints logged for model years 2019, 2020, 2021, 2022, and 2025. The source does not itemize symptoms, but the category indicates faults in electrical components. Fire-related severity signals were also recorded for several years, making electrical problems a safety-relevant area to inspect.
Powertrain and engine complaints were reported for model years 2019, 2020, 2021, and 2022, with 12 complaints in 2019 and 10 in 2020. The source does not specify symptoms, but the category covers engine and transmission faults. It is recommended to have a specialist inspect for drivability problems, warning lights, fluid leaks, and repair history.
Service brake complaints were logged for model years 2023 and 2024, with 7 complaints in 2023 and 4 in 2024, plus hydraulic brake complaints in 2023. The source does not detail symptoms, but the category indicates brake system faults. Inspecting brake pedal feel, fluid level, lines, and warning messages is advised.
Early-build 2025 Kia K4 sedans have reported instrument panel failures and inoperable power sunroofs, which appear to be electrical or assembly-quality defects rather than normal wear. These issues have not become a widespread recurring defect, and JD Power gave the 2025 and 2026 K4 models a reliability score of 86. The likely consequence is the need for dealer repair, typically covered under warranty, but no independent out-of-pocket cost estimate is available.
Fewer than 30 early-production 2025 Kia K4 vehicles were recalled for loose engine bolts, which can cause engine noise, vibration, oil leaks, or potentially engine damage. This is a safety compliance recall, so repairs are performed at no charge to the owner. Affected owners should contact a Kia dealer for inspection and repair.
BMW 4 Series and Kia K4 suit different driving needs. The main differences below cover price, monthly payment, fuel economy, and running costs.
The models use different powertrains: 4 Series — Hybrid; K4 — Gasoline. The better choice depends on your daily route and access to charging.
The final choice is about more than numbers: annual distance, city or highway use, and the space your household needs all matter. Use the CarPayCheck.com calculator to apply your financing terms and evaluate both cars in your situation.
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