NTK 25194 Oxygen Sensor - Upstream Right

Direct Fit Oxygen Sensor for Kia and Hyundai

NTK 25194 is a direct fit heated oxygen sensor built for specific upstream right applications. It is engineered for Bank 1 Sensor 1 placement and uses a threaded mounting design with a 4-wire configuration for a precise OE-style replacement.

Compatible with select Kia Rondo, Kia Magentis, Kia Optima, and Hyundai Santa Fe models, this NTK oxygen sensor supports accurate exhaust feedback for vehicles that rely on a properly functioning upstream sensor. The NTK 25194 part number is also referenced in OE-style replacement searches for these applications.

Key Features

• Direct fit oxygen sensor for specific vehicle applications
• Heated sensor design for faster operating response
• 4-wire construction
• Threaded mounting type with 18 mm thread diameter
• 12.25 in. wiring harness length
• Upstream right, Bank 1 Sensor 1 position
• Cross-reference: Bosch 15346, DENSO Auto Parts 234-4429

Product Details

NTK Direct Fit Oxygen Sensor 25194 is part of the brand’s direct replacement line for import and domestic vehicles. NTK applies ceramic manufacturing expertise and OE application knowledge to produce sensors with controlled material quality from raw input through finished component. As an OE oxygen sensor supplier, NTK builds this sensor to meet or exceed original equipment specifications for fit, form, and function. Search terms such as Kia Optima upstream right oxygen sensor, Hyundai Santa Fe Bank 1 Sensor 1 oxygen sensor, and Kia Rondo direct fit oxygen sensor all point to this application-specific replacement.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Slow or inaccurate upstream exhaust feedback
• Fault codes tied to Bank 1 Sensor 1 operation
• Driveability issues caused by a worn heated O2 sensor
• Replacement needs for a damaged or aging threaded sensor

Installation Notes and Tips

Verify the vehicle’s year, make, model, and sensor position before ordering. This part is listed for upstream right, Bank 1 Sensor 1 locations on the confirmed applications. Match the 4-wire connector and 18 mm threaded mounting style to the original sensor before installation. For best results, inspect the exhaust threads and wiring routing during replacement.

Quality Assurance

NTK manufactures oxygen sensors with extensive testing during production to help ensure reliability and OE-level performance. The brand’s focus on original equipment coverage and ceramic sensor technology supports consistent fit and function for the listed applications.