A-Premium Downstream O2 Oxygen Sensor for Hyundai & Kia — 4-Wire Heated, 680mm Cable

The A-Premium downstream O2 (oxygen) sensor is a direct-fit, heated replacement sensor built to restore accurate exhaust oxygen readings on compatible Hyundai and Kia models.

If your vehicle’s downstream oxygen sensor has failed, this A-Premium unit offers the same mounting style, connector type, and wiring configuration as many original equipment sensors so you can replace it without major modifications. Designed with a 4-wire heated element and a 680 mm cable, the sensor provides the electrical and mechanical fitment needed for specific Genesis, Hyundai, and Kia engines listed below. Always confirm fitment by entering your vehicle details on the product page and reading the special note before purchase.

Will this sensor fit my Hyundai or Kia model?

Compatibility depends on model year, engine type, and the sensor position (downstream, downstream rear/right/front). This A-Premium sensor covers many Genesis, Hyundai, and Kia vehicles with 2.0L–3.8L engines; check the fitment list for exact matches. If you are unsure, use the vehicle selector on the listing or contact us with your VIN for confirmation.

• Fits Genesis G70 2019–2023 L4 2.0L (downstream)
• Fits Hyundai Santa Fe, Sonata, Tucson models with specified years and engines
• Fits Kia Optima, Sorento, Sportage, Stinger, Telluride with listed positions
• Includes special positions: downstream rear/right/front for certain V6 models

What are the electrical and mechanical specifications?

This sensor uses a threaded mounting and a female connector with a 4-wire heated design for rapid warm-up and reliable signal under varying exhaust temperatures. Overall cable length is 680 mm, packaged as a single boxed sensor. The reference numbers help confirm correct replacement against OEM listings.

• Wire quantity: 4 (heated sensor wiring)
• Overall cable length: 680 mm for correct reach
• Mounting: threaded for direct installation
• Reference numbers: 250-241276, 250241276 for cross-checking

How does this replacement affect performance and diagnostics?

The downstream O2 sensor provides post-catalyst oxygen measurements used by the engine control system to monitor catalytic converter efficiency and emissions. Installing a properly matched replacement restores accurate downstream readings so diagnostic systems can evaluate after-treatment performance. It does not change engine tuning but helps clear emissions-related fault codes caused by a faulty sensor.

• Restores correct downstream oxygen voltage signals
• Keeps on-board diagnostics informed about catalytic efficiency
• Helps prevent false emissions-related error codes
• Heated element ensures quicker operation after cold starts

Who is this for? This A-Premium downstream oxygen sensor is intended for DIY enthusiasts, independent mechanics, and fleet technicians who need a reliable, cost-effective replacement for specific Hyundai and Kia vehicles. If you require a direct-fit heated sensor with a 4-wire connector and 680 mm lead, and your make/model appears in the fitment list, this sensor is a practical option. For peace of mind, verify the vehicle selector and the special note on the product page or contact support with your VIN before ordering.