Genuine Hyundai / Kia upstream Lambda (Oxygen / O₂) sensor, part number 39210-2M410. Manufactured by Hyundai KEFICO to original equipment standards, this 5-wire heated broadband sensor (LSU 5.2 type) is the primary regulating probe installed before the catalytic converter, delivering precise air-fuel ratio feedback to the ECU for accurate fuel trim control.

• This is a 5-wire heated broadband oxygen sensor (LSU 5.2) manufactured by Hyundai KEFICO to Hyundai and Kia's original equipment standards.
• The built-in heating element quickly brings the ceramic sensing tip up to operating temperature after a cold start, enabling the ECU to enter closed-loop fuel control sooner and reduce cold-start emissions.
• As an upstream (pre-catalyst / front / upper) regulating sensor, it is installed before the catalytic converter and serves as the primary regulating probe that directly influences the ECU's fuel trim adjustments.
• The broadband (LSU 5.2) design provides a continuous, linear signal representing the exact air-fuel ratio, which is essential for precise fuel management in modern turbocharged and hybrid engines.
• The sensor features a D-shaped 5-pin connector with a black housing and a cable length of approximately 480 mm.
• Also known as: O2 Sensor, Lambda Sensor, Upper Oxygen Sensor, Front Oxygen Sensor, Wideband Sensor, Air-Fuel Ratio Sensor, Exhaust Gas Sensor.

The following OE numbers are directly interchangeable or closely related to 39210-2M410. Always verify physical fitment (connector shape, pin count, cable length, and thread size) with your original part before purchasing.

• 39210-2M425 is the downstream (post-catalyst / rear / lower) oxygen sensor counterpart for many of the same vehicle applications. This part (39210-2M410) is the upstream (pre-catalyst / front / upper) sensor.
• 39212-2M410 is listed as a related reference number in some catalogues, associated with exhaust pressure sensor applications on the same engine family.
• The Intermotor 65154 aftermarket sensor is a direct replacement for 39210-2M410, featuring a 5-pin connector, D-shape connector, 480 mm cable length, and regulating sensor function, positioned before the catalytic converter.
• Always physically compare your old sensor's connector shape (D-shape), pin count (5), cable length (approx. 480 mm), and thread size (M18 × 1.5) before purchasing.

This Lambda Sensor is an original equipment component used across a range of Hyundai and Kia vehicles. Based on extensive cross-reference data, the sensor is installed in the upstream (pre-catalyst / front / upper) position.

• This is an upstream (pre-catalyst / front / upper) oxygen sensor. It is installed before the catalytic converter and serves as the primary regulating probe for air-fuel mixture control.
• Primary applications include Hyundai Elantra (2020–2023), Hyundai Sonata (2019–2023), Hyundai Santa Fe Hybrid (2020–2023), Hyundai Tucson (2020–Present), Hyundai Kona (2020–2023), Hyundai i20 N (2021–Present), Hyundai i30 Sedan (2020–Present); Kia Sorento (2021–2026), Kia Sportage (2022–2026), Kia Seltos (2021–2025), Kia K5 (2021–2024), Kia Carnival Hybrid (2025–2026), and Kia K4 (2025) with 1.6L turbocharged and 1.6L hybrid engines.
• How to verify: Locate your vehicle's catalytic converter. The upstream sensor is typically installed in the exhaust manifold or in the pipe immediately before the catalytic converter. If your faulty sensor is located before the converter, this part is suitable. If located after the converter, you need the downstream sensor 39210-2M425 instead.
• Not compatible with diesel engines — diesel applications use different sensors with different calibration parameters.
• The vehicle fitment information above is a guide only. Always confirm compatibility using your vehicle's VIN or by physically inspecting your old sensor's position, connector shape, and cable length before ordering.