2025 Kia K4 — Full Specifications
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The 2025 Kia K4 is a saloon/sedan offered with 2 engines (1.6L 4-cyl turbo, 2L 4-cyl). Its most fuel-efficient configuration returns around 40 mpg (UK) / 33 mpg (US EPA) combined, with 35–40 mpg (UK) across all configurations. Owners often keep a Kia K4 workshop manual to hand for servicing and repairs.
Full Specifications
| Engine (most efficient) | 2L 4-cyl |
|---|---|
| Engine options | 1.6L 4-cyl turbo · 2L 4-cyl |
| Transmission (most efficient) | Automatic (AV-S1) |
| Fuel Type | Regular Gasoline |
| Powertrain | Conventional |
| Drive | Front-Wheel Drive |
| Body Style | Saloon/Sedan |
| Passenger Volume (EPA) | 99 cu ft (2,803 L) |
| Luggage Volume (EPA) | 14 cu ft (396 L) |
| Fuel Economy (UK) | 40 combined / 35 urban / 47 extra-urban mpg |
| Fuel Economy (US EPA) | 33 combined / 29 city / 39 highway mpg |
| CO₂ Emissions | 170 g/km |
| EPA Greenhouse Gas Score | 6 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $2,050 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 2 configurations for the 2025 Kia K4 across 2 engines (1.6L 4-cyl turbo, 2L 4-cyl). Combined fuel economy ranges from 29 to 33 mpg (US), or 35 to 40 mpg (UK), depending on engine, transmission and drive. The headline figures at the top of this page describe the most fuel-efficient configuration.
| Engine | Transmission | Drive | MPG (UK) | MPG (US) | CO₂ g/km | Fuel cost / yr |
|---|---|---|---|---|---|---|
| 1.6L 4-cyl turbo | Automatic (S8) | Front-Wheel Drive | 35 | 29 (26/36) | 188 | $2,300 |
| 2L 4-cyl | Automatic (AV-S1) | Front-Wheel Drive | 40 | 33 (29/39) | 170 | $2,050 |
MPG (US) shows combined, with city/highway in brackets. Highlighted row = the configuration used for the headline figures. Source: US EPA fueleconomy.gov.
EPA measures interior passenger volume at 99 cubic feet (about 2,803 litres) and luggage volume at 14 cubic feet (about 396 litres). These are US EPA interior-volume figures; they are measured differently from the boot capacity numbers UK manufacturers quote.
Owner Essentials for the 2025 Kia K4
Running Costs: 2025 Kia K4
Covering around 8,000 miles a year in a 2025 Kia K4 at 40 mpg combined, expect roughly 909 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $2,050 a year in fuel for the most efficient configuration (15,000 miles, national average prices). Work out exact fuel costs with the fuel cost calculator on 247Calculators.
Convert between MPG and L/100km with the unit converters on 247QuickTools. Not sure what tyre size fits? 247TyreCheck explains tyre sizing.
Only need this car occasionally? See our buy vs rent comparison.
2025 Kia K4 Safety Ratings (NHTSA)
Recalls & Owner Complaints (NHTSA)
NHTSA lists 2 safety recall campaigns that include the 2025 Kia K4 (as of 6 October 2026). Most affected areas: Electrical system (1), Engine and engine cooling (1). A campaign often covers several model years or models, so check your own VIN to see whether your car is affected.
- Electrical system — campaign 26V046000, reported 27 January 2026. Risk: An instrument panel display that fails to show critical safety information, such as the speedometer, tire pressure, or warning lights, increases the risk of a crash.
- Engine and engine cooling — campaign 25V548000, reported 25 August 2025. Risk: A loss of drive power increases the risk of a crash.
Owners have filed 46 complaints with NHTSA about the 2025 Kia K4. The most-reported areas are Electrical system (13), Unspecified (12), Air bags (7). Complaints include 10 reported crashes, 8 reported injuries.
Used-buyer checklist for the 2025 Kia K4
Based on where NHTSA recalls and owner complaints cluster for this model year, these are the areas worth checking before you buy:
- Electrical system (1 recall campaign · 13 owner complaints) — Test every switch, window, light and warning lamp on a test drive, and ask about battery or alternator replacements.
- Engine cooling (1 recall campaign) — Check coolant level, look for leaks and make sure the temperature stays steady in traffic.
- Air bags (7 owner complaints) — Confirm any air bag inflator or module recalls were completed — enter the VIN at nhtsa.gov/recalls.
- Driver-assist sensors (7 owner complaints) — Check that driver-assist warning lights are off and sensors are clean and undamaged.
Source: US NHTSA recall and consumer-complaint databases, retrieved 6 October 2026. Complaints are unverified owner reports, not confirmed defects. Check any vehicle by VIN at nhtsa.gov/recalls, and see our guide to checking a used car for recalls.
How It Compares
Kia models in our database average about 34 mpg (UK) combined on their most efficient configuration; the 2025 Kia K4's 40 mpg is 6 mpg above that make average. Its 170 g/km CO₂ figure is 37 g/km lower than the 207 g/km Kia average.
Last updated: · Data: US EPA (fueleconomy.gov) and NHTSA safety ratings 18 July 2026; NHTSA recalls and complaints 6 October 2026; Wikidata & curated EU catalogue 18 July 2026; European generation and engine data from Wikipedia 7 October 2026
Vehicle data sourced from manufacturer specifications. Always verify with your vehicle handbook or a qualified mechanic. This is a reference tool, not professional advice.
Recommended Accessories for the 2025 Kia K4
Frequently Asked Questions
What engine does the 2025 Kia K4 have?
EPA lists 2 engines for the 2025 Kia K4: 1.6L 4-cyl turbo, 2L 4-cyl. The most fuel-efficient configuration pairs the 2L 4-cyl with a automatic (av-s1).
What is the fuel economy of the 2025 Kia K4?
The most efficient configuration returns around 40 mpg (UK) combined, or 33 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 35 to 40 mpg.
How much does the 2025 Kia K4 cost to fuel per year?
The US EPA estimates about $2,050 a year in fuel for the most efficient configuration, based on 15,000 miles of mixed driving and national average fuel prices. Your own cost will depend on mileage and local prices.
Does the 2025 Kia K4 have a good safety rating?
It holds an overall NHTSA rating of 5 stars, with 4 stars for frontal crash protection.
Does the 2025 Kia K4 have any recalls?
NHTSA lists 2 safety recall campaigns that include the 2025 Kia K4 (as of 6 October 2026). Most affected areas: Electrical system (1), Engine and engine cooling (1). A campaign often covers several model years or models, so check your own VIN to see whether your car is affected.
What are the most common problems reported for the 2025 Kia K4?
Among the 46 owner complaints filed with NHTSA, the most-reported areas are Electrical system (13 complaints), Unspecified (12 complaints), Air bags (7 complaints). Complaints are unverified owner reports, not confirmed defects, and raw counts rise with how many cars were sold.
How much interior and luggage space does the 2025 Kia K4 have?
EPA measures interior passenger volume at 99 cubic feet (about 2,803 litres) and luggage volume at 14 cubic feet (about 396 litres). These are US EPA interior-volume figures, which are measured differently from the UK boot-capacity numbers manufacturers quote.