NTK 25211 Oxygen Sensor - Upstream Left

Direct Fit Oxygen Sensor for Hyundai and Kia

NTK Direct Fit Oxygen Sensor 25211 is a heated, specific-fit replacement built for upstream left applications. It is engineered for select Hyundai Santa Fe, Santa Fe XL, Azera, and Kia Sedona, Sorento, and Cadenza models, with OE-style fit, form, and function.

NTK’s Direct Fit Oxygen Sensor line focuses on application-specific coverage and precise sensor design for import and domestic vehicles. Part number 25211 uses a threaded mounting style, 18 mm thread diameter, 4-wire configuration, and a 12.5 in. wiring harness length for direct replacement service.

Key Features

• Heated oxygen sensor for upstream left placement
• Specific-fit design for direct replacement service
• 4-wire configuration with 12.5 in. wiring harness
• 18 mm threaded mounting style
• OE-style fit, form, and function from NTK
• Cross-reference: DENSO Auto Parts 234-4458

Detailed Description

NTK 25211 is a direct fit oxygen sensor for Bank 2, Sensor 1 applications on select Hyundai and Kia vehicles. It is listed for 2010-2018 Hyundai Santa Fe, 2013-2019 Hyundai Santa Fe XL, 2012-2017 Hyundai Azera, 2011-2012 Kia Sedona, 2014-2018 Kia Sedona, 2011-2018 Kia Sorento, and 2014-2016 Kia Cadenza. This part number is also associated with OE-style replacement needs where accurate exhaust gas feedback is required for engine management.

NTK manufactures oxygen sensors with controlled ceramic technology and extensive production testing to support consistent performance and reliability. Part number 25211 is built for direct replacement on Hyundai Santa Fe and Kia Sorento applications where the upstream left sensor location is specified.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback to the engine control system
• Slow or inaccurate upstream sensor response
• Emissions system faults tied to Bank 2, Sensor 1
• Driveability issues caused by faulty exhaust oxygen readings

Installation Notes and Tips

Verify the vehicle year, make, model, and upstream left position before ordering. This sensor is a specific-fit replacement, so confirm the connector, wire count, and threaded mounting style match the original part. For best results, inspect the exhaust bung threads and wiring routing before installation on Hyundai Santa Fe, Santa Fe XL, Kia Sedona, Kia Sorento, or Kia Cadenza applications.

Quality Assurance

NTK is part of the NGK family of products and is a major original equipment oxygen sensor manufacturer. The brand states that these sensors are tested during manufacturing to meet or exceed OE specifications, with application coverage supported by OE-focused technology.