The 39210-2B220 is a genuine Hyundai / Kia heated switching-type oxygen (lambda / O₂) sensor engineered to original equipment specifications. As a downstream (post-catalyst / rear / lower) diagnostic sensor, it is installed after the catalytic converter and monitors catalyst efficiency by comparing its signal against the upstream sensor. Built with a stainless-steel shell and a zirconium-oxide ceramic element, it delivers reliable emissions control and long service life.

• This is a 4-wire heated switching-type oxygen sensor manufactured to Hyundai and Kia original equipment standards. The four wires serve two independent circuits — two for the internal heater and two for the sensor signal and ground.
• 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 a downstream (post-catalyst / rear / lower) diagnostic sensor, it is installed after the catalytic converter and monitors catalyst efficiency by comparing its signal with the upstream sensor.
• Constructed with a stainless-steel shell that reduces rusting and provides greater dependability. The centre ceramic element is composed of Zirconium Oxide, Alumina, and Yttrium Oxide. The platinum coating is applied using vapour deposition, whilst a Spinel coating on the outer platinum layer prevents solid particles in the exhaust gas from damaging the component.
• Features a rectangular 4-pin connector with a black housing and a standard cable length of approximately 495 mm.
• Cable length variations: Documented cable lengths for this OE number include 495 mm, 405 mm, 570 mm, 700 mm, and 750 mm, depending on the aftermarket manufacturer. Always measure your original sensor before ordering.
• All sensors are 100% tested to meet or exceed original equipment quality standards.

The following OE numbers are directly interchangeable or closely related to 39210-2B220. These references are frequently grouped together across multiple aftermarket catalogues.

• 39210-2B320 is a closely related downstream sensor for the same vehicle family and is frequently listed alongside 39210-2B220.
• 39210-2B120 and 39210-2B140 are also interchangeable references for specific Hyundai applications.
• The Lemark LLB866 and Intermotor 64880 aftermarket sensors list 392102B220, 392102B320, 392102B325, 392102B350, and 392102B355 (Hyundai) and 392102B290, 392102B320, 392102B323, 392102B326, 392102B350, and 392102B355 (Kia) as interchangeable references.
• 39210-2B330 is listed as an interchangeable reference in some aftermarket catalogues.
• Always physically compare your old sensor's connector shape (rectangular), pin count (4), cable length, 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 available cross-reference data, the sensor is installed in the downstream (post-catalyst / rear / lower) position.

• This is a downstream (post-catalyst / rear / lower) oxygen sensor. It is installed after the catalytic converter and serves as a diagnostic probe for catalyst efficiency monitoring.
• Primary applications include Hyundai Accent (2012–2017), Hyundai Veloster (2012–2017), Kia Rio (2012–2018), and Kia Soul (2012–2016) with 1.6L petrol engines.
• Additional applications include Hyundai ix35/Tucson (2010–2015), i20 (2008–2014), i30 (2007–2016); Kia Cee'd (2007–2018), Sportage (2010–2015), and Venga (2010–2019) with 1.4L and 1.6L petrol engines.
• How to verify: Locate your vehicle's catalytic converter. This sensor is installed in the pipe after the catalytic converter. If your faulty sensor is located before the converter, a different part number is required.
• 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.