NTK 25169 Oxygen Sensor - Downstream Left

Direct Fit Oxygen Sensor for Hyundai and Kia

NTK 25169 is a direct fit heated oxygen sensor built for specific downstream left applications on select Hyundai and Kia vehicles. It is engineered for the B2S2 location and uses a threaded mounting design with a 4-wire configuration for OE-style replacement.

As part of NTK’s Direct Fit Oxygen Sensor line, this sensor is built around application-specific coverage and OE-style fit, form, and function. NTK applies ceramic manufacturing expertise and extensive production testing to support consistent signal performance and reliable installation on import applications such as the Hyundai Sonata, Hyundai Santa Fe, Kia Optima, and Kia Magentis.

Key Features

• Direct fit oxygen sensor for specific downstream left applications
• Heated sensor design for faster operating temperature
• 4-wire configuration with 16-inch wiring harness length
• Threaded mounting type with 18 mm thread diameter
• Application coverage for select Hyundai and Kia models
• Cross-reference example: Bosch 13749

Detailed Product Information

NTK 25169 is a replacement oxygen sensor for vehicles that require a downstream left sensor in the B2S2 position. It is listed for 1999-2002 Hyundai Sonata, 2001-2002 Hyundai Santa Fe, 2001-2002 Kia Optima, and 2001-2002 Kia Magentis, with fitment notes that identify the exact production cutoffs for certain model years. If you are searching for a direct fit oxygen sensor for a 2002 Hyundai Sonata downstream left or a 2002 Kia Optima B2S2 application, this part number is the correct OE-style reference to verify.

NTK is known for oxygen sensor manufacturing across import and domestic applications, and this part reflects that focus with application-specific engineering and manufacturing controls from raw ceramic material through finished sensor production. The result is a replacement sensor intended to match the original mounting and electrical layout used on the listed vehicles. NTK 25169 also cross-references Delphi ES10897 for the same application.

Common Problems This Part Can Address

• Check engine light related to oxygen sensor performance
• Fault codes tied to downstream left sensor readings
• Slow or inaccurate exhaust oxygen signal response
• Failed sensor heater circuit on the listed applications
• Replacement needs for B2S2 oxygen sensor locations

Installation Notes and Tips

Verify the vehicle’s production date before ordering, especially for 2002 Hyundai Sonata, Kia Magentis, and Kia Optima applications with cutoff dates noted in the fitment data. Confirm the downstream left B2S2 location, threaded mounting style, and 4-wire connector layout before installation. For best results, inspect the harness routing and connector condition on the existing sensor before replacing the unit.

Quality Assurance

NTK manufactures oxygen sensors with OE application coverage and extensive production testing to support quality and reliability that meet or exceed original equipment specifications. The brand’s focus on ceramic sensor technology and original equipment supply helps ensure consistent fit and function for the listed Hyundai and Kia applications.