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NTK
Direct Fit Oxygen SensorNTK 25612 Oxygen Sensor - Downstream, Downstream Left or Downstream Right
| Brand | NTK 25612 |
|---|---|
| Position | Downstream Left, Downstream, and Downstream Right |
| Wiring Harness Length | 16.7500 |
| Sensor Type | Heated |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Thread Diameter | 18.000 |
| Mounting Type | Threaded |
| Product line | Direct Fit Oxygen Sensor |
| Fits | BMW, Mercedes-Benz, and Rolls-Royce · 88 vehicles |
Direct fit design. Specific replacement for listed applications with OE-style form and function.
Heated sensor. Helps the sensor reach operating temperature quickly for responsive exhaust monitoring.
OE-level testing. Manufactured and tested to meet or exceed original equipment specifications.
Cross-references Bosch 16320, Bosch 16421 and Bosch 16808 for the same application. See all 20.
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Direct Fit Oxygen Sensor Overview
NTK 25612 is a direct fit heated oxygen sensor built for specific import applications. It uses a threaded mounting design with a 4-wire layout and OE-style fit, form, and function for accurate replacement service.
Compatible with BMW, Mercedes-Benz, and Rolls-Royce applications, this sensor supports downstream exhaust monitoring where the original sensor has failed or is no longer responding correctly. The NTK 25612 is engineered for specific fitment, not universal use.
Key Features
- Heated oxygen sensor for faster operating response
- Specific-fit design for direct replacement service
- Threaded mounting type for OE-style installation
- 4-wire configuration for the listed applications
- 16.7500 wiring harness length
- 18.000 thread diameter
Detailed Application Notes
This NTK oxygen sensor is listed for downstream positions on select BMW X6, BMW M3, BMW X5, BMW 550i, BMW 650i, BMW 323i, BMW 750i, BMW 750Li, BMW 760Li, BMW 525i, BMW 525xi, BMW 530i, BMW 530xi, Mercedes-Benz CLK320, Mercedes-Benz CLK430, Mercedes-Benz CLK55 AMG, and Rolls-Royce Phantom applications. The part number 25612 should be matched to the exact vehicle, model year, and downstream position shown in the fitment data.
NTK is part of the NGK family and is recognized as a major original equipment oxygen sensor supplier. The brand uses ceramic-focused manufacturing technology and tests sensors during production to meet OE-level specifications for fit and reliability. This part cross-references Bosch (e.g., 16320, 16421) for the same application.
Common Replacement Reasons
- Fault codes related to downstream oxygen sensor performance
- Incorrect air-fuel feedback from a worn sensor
- Slow sensor response during exhaust monitoring
- Failed emissions inspection tied to oxygen sensor output
- Damaged connector or degraded sensor wiring
Installation Notes and Quality
Confirm the exact position, connector style, and thread specification before installation. Because this is a specific-fit sensor, it should be matched to the vehicle application listed in the fitment table rather than substituted by universal part type alone.
NTK 25612 is manufactured and tested to meet or exceed OE specifications, with application coverage developed for import and domestic sensor needs.
This part fits 88 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
| Year | Make | Model | Submodel | Body Type | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|---|
| 2014 | BMW | X6 | M | — | 4.4L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2014 | BMW | X6 | M | — | 4.4L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2013 | BMW | M3 | — | — | 4.0L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2013 | BMW | M3 | — | — | 4.0L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2013 | BMW | X5 | M | — | 4.4L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2013 | BMW | X5 | M | — | 4.4L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2013 | BMW | X6 | M | — | 4.4L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2013 | BMW | X6 | M | — | 4.4L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2012 | BMW | M3 | — | — | 4.0L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2012 | BMW | M3 | — | — | 4.0L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2012 | BMW | X5 | M | — | 4.4L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2012 | BMW | X5 | M | — | 4.4L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2012 | BMW | X6 | M | — | 4.4L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2012 | BMW | X6 | M | — | 4.4L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2011 | BMW | M3 | — | — | 4.0L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2011 | BMW | M3 | — | — | 4.0L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2011 | BMW | X5 | M | — | 4.4L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2011 | BMW | X5 | M | — | 4.4L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2011 | BMW | X6 | M | — | 4.4L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2011 | BMW | X6 | M | — | 4.4L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2011 | Rolls-Royce | Phantom | — | — | 6.7L | V12 | Downstream Right | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 2011 | Rolls-Royce | Phantom | — | — | 6.7L | V12 | Downstream Left | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 2010 | BMW | 550i | — | — | 4.8L | V8 | Downstream Left | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 2010 | BMW | 650i | — | — | 4.8L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2010 | BMW | M3 | — | — | 4.0L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2010 | BMW | M3 | — | — | 4.0L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2010 | BMW | X5 | — | — | 4.8L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2010 | BMW | X5 | — | — | 4.8L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2010 | BMW | X5 | — | — | 4.4L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2010 | BMW | X5 | — | — | 4.4L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2010 | BMW | X6 | M | — | 4.4L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2010 | BMW | X6 | M | — | 4.4L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2010 | Rolls-Royce | Phantom | — | — | 6.7L | V12 | Downstream Right | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 2010 | Rolls-Royce | Phantom | — | — | 6.7L | V12 | Downstream Left | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 2009 | BMW | 323i | — | — | 2.5L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2009 | BMW | 550i | — | — | 4.8L | V8 | Downstream Left | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 2009 | BMW | 650i | — | — | 4.8L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2009 | BMW | M3 | — | — | 4.0L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2009 | BMW | M3 | — | — | 4.0L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2009 | BMW | X5 | — | — | 4.8L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2009 | BMW | X5 | — | — | 4.8L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2009 | Rolls-Royce | Phantom | — | — | 6.7L | V12 | Downstream Right | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 2009 | Rolls-Royce | Phantom | — | — | 6.7L | V12 | Downstream Left | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 2008 | BMW | 323i | — | — | 2.5L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2008 | BMW | 550i | — | — | 4.8L | V8 | Downstream Left | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 2008 | BMW | 650i | — | — | 4.8L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2008 | BMW | 750i | — | — | 4.8L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2008 | BMW | 750Li | — | — | 4.8L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2008 | BMW | 760Li | — | — | 6.0L | V12 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2008 | BMW | 760Li | — | — | 6.0L | V12 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2008 | BMW | M3 | — | — | 4.0L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2008 | BMW | M3 | — | — | 4.0L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2008 | BMW | X5 | — | — | 4.8L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2008 | BMW | X5 | — | — | 4.8L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2008 | Rolls-Royce | Phantom | — | — | 6.7L | V12 | Downstream Right | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 2008 | Rolls-Royce | Phantom | — | — | 6.7L | V12 | Downstream Left | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 2007 | BMW | 323i | — | — | 2.5L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2007 | BMW | 525i | — | — | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2007 | BMW | 525xi | — | — | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2007 | BMW | 530i | — | — | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2007 | BMW | 530xi | — | — | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2007 | BMW | 550i | — | — | 4.8L | V8 | Downstream Left | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 2007 | BMW | 650i | — | — | 4.8L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2007 | BMW | 750i | — | — | 4.8L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2007 | BMW | 750Li | — | — | 4.8L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2007 | BMW | 760Li | — | — | 6.0L | V12 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2007 | BMW | 760Li | — | — | 6.0L | V12 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2007 | BMW | X5 | — | — | 4.8L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2007 | BMW | X5 | — | — | 4.8L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2007 | Rolls-Royce | Phantom | — | — | 6.7L | V12 | Downstream Right | From 9/06; OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2007 | Rolls-Royce | Phantom | — | — | 6.7L | V12 | Downstream Left | From 9/06; OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2006 | BMW | 323i | — | — | 2.5L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2006 | BMW | 525i | — | — | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2006 | BMW | 525xi | — | — | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2006 | BMW | 530i | — | — | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2006 | BMW | 530xi | — | — | 3.0L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2006 | BMW | 550i | — | — | 4.8L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2006 | BMW | 650i | — | — | 4.8L | V8 | Downstream Right | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2006 | BMW | 750i | — | — | 4.8L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2006 | BMW | 750Li | — | — | 4.8L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2003 | Mercedes-Benz | CLK320 | — | Convertible | 3.2L | V6 | Downstream Left | Equivalent OE design oxygen sensor; Direct Fit Oxygen Sensor |
| 2003 | Mercedes-Benz | CLK430 | — | — | 4.3L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2002 | Mercedes-Benz | CLK320 | — | — | 3.2L | V6 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2002 | Mercedes-Benz | CLK430 | — | — | 4.3L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2002 | Mercedes-Benz | CLK55 AMG | — | — | 5.5L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2001 | Mercedes-Benz | CLK320 | — | — | 3.2L | V6 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2001 | Mercedes-Benz | CLK430 | — | — | 4.3L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2001 | Mercedes-Benz | CLK55 AMG | — | — | 5.5L | V8 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| No rows match your filter. | ||||||||
Directly replaces or cross-references 20 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Bosch — 16320Bosch — 16421Bosch — 16808Bosch — 16864Delphi — ES20376DENSO Auto Parts — 234-4875DENSO Auto Parts — 234-4877DENSO Auto Parts — 234-4893Walker Exhaust — 1679375-170875-374075-375575-375975-3861213-2897135800015407117117875391251178754465411787558179