HQPASFY Oxygen O2 Sensor Upstream & Downstream for Hyundai/Kia – 234-5029/234-4238 (2 Pcs)

Enhance engine monitoring with HQPASFY Oxygen Sensor Kit

This HKPASFY Oxygen sensor kit provides upstream and downstream sensors designed to work with a broad range of Hyundai and Kia models. Delivered as a 2-piece set, it’s built to help your vehicle continuously monitor the air–fuel mix, supporting smoother idle and consistent performance as you drive. The kit references the common replacement numbers (upstream 234-5029 and downstream 234-4238) and is suitable for many 2.0L and 2.4L engines across select generations, offering a practical option when replacement is needed to maintain engine awareness and efficiency.

With real-world use in mind, the sensors are designed to fit directly into your existing harness and mounting points, helping to maintain proper exhaust and engine management signals. The result can be a more stable engine response and a steady drive feel, especially in city traffic or during highway cruising, where precise fuel adjustment matters. While not a guarantee of performance improvements, proper sensing is a foundation for balanced combustion and responsive throttle interaction.

What you get and where it fits

• Compatibility covers Hyundai: Tucson (2011-2015, 2.0L), Tucson (2010-2013, 2.0L), Sonata (2009-2012, 2.4L), Santa Fe (2010-2015, 2.4L).
• Compatibility covers Kia: Forte (2010-2013, 2.0L-2.4L), Forte5 (2012-2013, 2.0L-2.4L), Forte Koup (2010-2013, 2.0L-2.4L), Optima/Optima Hybrid (2011-2013, 2.4L), Rondo (2009-2012, 2.4L), Sorento (2011-2015, 2.4L), Sportage (2011-2014, 2.4L).
• Replaces upstream: 234-5029, 39210-2G100; downstream: 234-4238, 39210-2G200, 39210-2C210.

How this sensor supports your engine’s performance

• Accurately detects air–fuel mixture, helping the ECU monitor and adjust fuel delivery for efficient combustion.
• Direct-fit design for reliable electrical connections and easier installation in compatible Hyundai and Kia models.
• Endorsed by a 24-month warranty for long-term peace of mind and dependable service life.

Installation notes—Before mounting, clean carbon deposits from the sensor interface, reset the vehicle ECU with an OBD tool, and use a dedicated oxygen sensor wrench to secure the sensor. These steps can help ensure proper recognition by the vehicle system and prevent contact issues during startup.

These sensors are presented as a practical replacement option when your OEM unit is showing signs of sluggish response, inconsistent operation, or idle irregularities. While results can vary by vehicle condition and driving environment, choosing a high-quality sensor can support consistent monitoring and predictable engine behavior across typical daily use.