NTK 25198 Oxygen Sensor - Downstream

Direct Fit Oxygen Sensor for Mini Applications

NTK Oxygen Sensor 25198 is a direct fit, heated downstream sensor built for specific applications that require OE-style signal accuracy and connector compatibility. It is engineered for Mini Cooper, Mini Cooper Countryman, and Mini Cooper Paceman models where the downstream B1S2 sensor location is specified.

NTK’s Direct Fit Oxygen Sensor line focuses on precise fit, form, and function for import and domestic vehicles. Part number 25198 uses NTK’s ceramic manufacturing expertise and is tested during production to meet or exceed OE specifications for quality and reliability.

Key Features

• Direct fit oxygen sensor for specific vehicle applications
• Heated sensor design for faster operating temperature
• 4-wire configuration with a 17.5 in. wiring harness length
• Threaded mounting type with 18 mm thread diameter
• Downstream B1S2 application coverage for select Mini models
• NTK part number 25198 for OE-style replacement matching

Application Details

Compatible with 2007-2015 Mini Cooper, downstream; 2011-2016 Mini Cooper Countryman, downstream; and 2013-2016 Mini Cooper Paceman, downstream. This part cross-references Bosch 15379 for the same application. If you are searching for a Mini Cooper downstream oxygen sensor or an NTK 25198 replacement oxygen sensor, this direct fit unit is built for those OE-matched applications.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect oxygen sensor voltage or slow sensor response
• Emissions system faults tied to B1S2 sensor performance
• Rough fuel control caused by inaccurate exhaust feedback
• Failed inspection results linked to oxygen sensor issues

Installation Notes

Verify the connector, thread size, and downstream position before installation. This sensor uses a specific fit design, so it should be matched to the exact Mini application listed above. Confirm the harness length and routing path during replacement to avoid strain on the wiring.

Quality Assurance

NTK is a major original equipment oxygen sensor manufacturer, and this part is manufactured and tested to meet or exceed OE specifications. The Direct Fit Oxygen Sensor line is supported by NTK’s OE application focus and manufacturing controls for consistent fit and performance.