A-Premium O2 Oxygen Sensor for Hyundai & Kia (Veloster, Elantra, Soul) — Heated 4‑Wire Direct-Fit

A-Premium O2 Oxygen Sensor is a direct-fit heated replacement sensor designed to restore accurate air-fuel monitoring on select Hyundai and Kia models.

When an engine runs poorly, triggers a check engine light, or fails emissions testing, a worn or failing oxygen (O2) sensor is often the cause. This A-Premium sensor is a threaded, heated, 4-wire unit made to match original equipment locations on specific Hyundai Veloster, Elantra, Elantra GT, and Kia Soul model years. It ships one sensor per box and includes a one-year unlimited-mileage warranty for added confidence.

Which vehicle models and sensor positions does this fit?

This sensor covers several specific model years and installation positions—both downstream (B1S2) and upstream (B1S1) depending on vehicle and engine. Always verify the required bank and sensor position before ordering to avoid a mismatch.

• Downstream (B1S2): Hyundai Veloster 2019–2021 2.0L, Elantra 2017–2019 2.0L, Elantra GT 2018–2020 2.0L; Kia Soul 2017–2020 2.0L and 2021 2.0L.
• Upstream (B1S1): Kia Soul 2010–2011 1.6L.
• Check factory service manual or existing sensor label if unsure of bank/sensor number.

What are the technical specs and part references for this sensor?

The unit is built to mirror original equipment design: a threaded mount, heated element, and a four-conductor connector for sensor signal, heater power, and grounds. It’s boxed and sold as a single replacement part with several cross-reference numbers for easy identification.

• Wire count: 4 (heated sensor configuration).
• Mounting: threaded for standard O2 sensor ports.
• Connector gender: male; ensure plug compatibility with your vehicle harness.
• Reference numbers: 250-24779, 234-4239, 25024779, 2344239, 392102B040, 392103F000, 392103F020, 392103F050.

How does installation and performance compare to OEM parts?

The sensor is designed as a direct replacement that uses the same mounting and electrical connections as many factory units. A correct-fit sensor supports proper closed-loop fuel control and emissions system function when installed in the right position and wired to the existing harness.

• Heated element shortens warm-up time to reach operating temperature.
• Threaded body matches factory sensor ports—use correct torque and anti-seize as recommended.
• 4-wire connector aligns with factory harness pins; check clip retention before final assembly.

Who is this for: This A-Premium oxygen sensor is intended for DIY mechanics and professional technicians replacing a failed or aging O2 sensor on supported Hyundai and Kia models. It’s suited for anyone needing a direct-fit, heated 4-wire replacement and who can confirm the required bank and sensor position. Choose this sensor when you want a boxed single-unit replacement with industry reference numbers and a one-year unlimited-mileage warranty.