NTK 25658 Oxygen Sensor - Downstream
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NTK
 Direct Fit Oxygen Sensor

NTK 25658 Oxygen Sensor - Downstream

Brand NTK 25658
Position Downstream
Wiring Harness Length 39.2500
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 · 46 vehicles

Direct fit design. Specific application replacement with OE-style fit, form, and function.

Heated sensor. Built for faster operating response and stable emissions monitoring.

OE supplier pedigree. NTK is a major original equipment oxygen sensor manufacturer.

Cross-references Bosch 15680, Bosch 15681 and Delphi ES10914 for the same application. See all 8.

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Direct Fit Oxygen Sensor Overview

The NTK 25658 is a direct fit heated oxygen sensor built for specific downstream applications. It is engineered for BMW 325i, 325Ci, 330i, 330Ci, 525i, 530i, and X3 coverage where OE-style fit and signal performance are required.

NTK 25658 uses a threaded mounting design, a 4-wire layout, and a 39.2500 wiring harness length for application-specific replacement. This part cross-references Bosch 15680 and 15681 for the same application.

Key Features

  • Direct fit, specific application oxygen sensor
  • Heated sensor design for faster operating response
  • Threaded mounting type for OE-style installation
  • 4-wire configuration
  • 39.2500 wiring harness length
  • 18.000 thread diameter

Fitment Details

  • Fits 2003-2006 BMW 325Ci, downstream.
  • Fits 2003-2006 BMW 325Ci, downstream, cylinders 1-3 downstream oxygen sensor equivalent to OE design.
  • Fits 2004-2006 BMW 330Ci, downstream.
  • Fits 2004-2006 BMW 330Ci, downstream, cylinders 1-3 downstream oxygen sensor equivalent to OE design.
  • Fits 2004-2006 BMW X3, downstream.
  • Fits 2004-2006 BMW X3, downstream, cylinders 1-3 downstream oxygen sensor equivalent to OE design.
  • Fits 2003-2005 BMW 325i, downstream.
  • Fits 2003-2005 BMW 325i, downstream, cylinders 1-3 downstream oxygen sensor equivalent to OE design.
  • Fits 2004-2005 BMW 330i, downstream.
  • Fits 2004-2005 BMW 330i, downstream, cylinders 1-3 downstream oxygen sensor equivalent to OE design.
  • Fits 2004-2005 BMW 525i, downstream.
  • Fits 2004-2005 BMW 525i, downstream, cylinders 1-3 downstream oxygen sensor equivalent to OE design.
  • Fits 2004-2005 BMW 530i, downstream.
  • Fits 2004-2005 BMW 530i, downstream, cylinders 1-3 downstream oxygen sensor equivalent to OE design.
  • Fits 2003 BMW 325Ci, downstream, cylinders 4-6; B2S2; from 3/03.
  • Fits 2003 BMW 325Ci, downstream, cylinders 1-3; B1S2; from 3/03.
  • Fits 2003 BMW 325i, downstream, cylinders 4-6; B2S2; from 3/03.
  • Fits 2003 BMW 325i, downstream, cylinders 1-3; B1S2; from 3/03.
  • Fits 2003 BMW 330Ci, downstream, cylinders 4-6; B2S2; from 3/03.
  • Fits 2003 BMW 330Ci, downstream, cylinders 1-3; B1S2; from 3/03.
  • Fits 2003 BMW 330i, downstream, cylinders 4-6; B2S2; from 3/03.
  • Fits 2003 BMW 330i, downstream, cylinders 1-3; B1S2; from 3/03.

What It Helps Address

  • Faulty downstream oxygen sensor readings
  • Check engine light concerns related to sensor performance
  • Incorrect air-fuel feedback after catalyst monitoring
  • Slow sensor response from a worn heated sensor
  • Fitment issues from a non-specific replacement part

Installation Notes and Quality

Use the vehicle’s exact engine-bank and sensor-position callout in the fitment notes before ordering. The threaded design and specific-fit configuration support OE-style replacement on the listed BMW applications.

NTK is a major original equipment oxygen sensor supplier, and this 25658 sensor is extensively tested during manufacturing to meet or exceed OE specifications. The NTK 25658 is part of the Direct Fit Oxygen Sensor line, focused on application-specific coverage and OE-style fit, form, and function.

Related reading

This part fits 46 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelTransmissionLitersCylindersPositionNotes
2006BMW325Ci—2.5LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2006BMW325Ci—2.5LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2006BMW330Ci—3.0LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2006BMW330Ci—3.0LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2006BMWX3Automatic3.0LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2006BMWX3Automatic3.0LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2005BMW325Ci—2.5LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2005BMW325Ci—2.5LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2005BMW325i—2.5LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2005BMW325i—2.5LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2005BMW330Ci—3.0LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2005BMW330Ci—3.0LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2005BMW330i—3.0LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2005BMW330i—3.0LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2005BMW525i—2.5LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2005BMW525i—2.5LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2005BMW530i—3.0LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2005BMW530i—3.0LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2005BMWX3Automatic3.0LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2005BMWX3Automatic3.0LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2004BMW325Ci—2.5LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2004BMW325Ci—2.5LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2004BMW325i—2.5LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2004BMW325i—2.5LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2004BMW330Ci—3.0LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2004BMW330Ci—3.0LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2004BMW330i—3.0LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2004BMW330i—3.0LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2004BMW525i—2.5LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2004BMW525i—2.5LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2004BMW530i—3.0LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2004BMW530i—3.0LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2004BMWX3Automatic3.0LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2004BMWX3Automatic3.0LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2003BMW325Ci—2.5LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2003BMW325Ci—2.5LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2003BMW325Ci—2.5LL6DownstreamCyls. 4-6; B2S2; From 3/03; OE Equivalent Design; Direct Fit Oxygen Sensor
2003BMW325Ci—2.5LL6DownstreamCyls. 1-3; B1S2; From 3/03; OE Equivalent Design; Direct Fit Oxygen Sensor
2003BMW325i—2.5LL6DownstreamCyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor
2003BMW325i—2.5LL6DownstreamCylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor
2003BMW325i—2.5LL6DownstreamCyls. 4-6; B2S2; From 3/03; OE Equivalent Design; Direct Fit Oxygen Sensor
2003BMW325i—2.5LL6DownstreamCyls. 1-3; B1S2; From 3/03; OE Equivalent Design; Direct Fit Oxygen Sensor
2003BMW330Ci—3.0LL6DownstreamCyls. 4-6; B2S2; From 3/03; OE Equivalent Design; Direct Fit Oxygen Sensor
2003BMW330Ci—3.0LL6DownstreamCyls. 1-3; B1S2; From 3/03; OE Equivalent Design; Direct Fit Oxygen Sensor
2003BMW330i—3.0LL6DownstreamCyls. 4-6; B2S2; From 3/03; OE Equivalent Design; Direct Fit Oxygen Sensor
2003BMW330i—3.0LL6DownstreamCyls. 1-3; B1S2; From 3/03; OE Equivalent Design; Direct Fit Oxygen Sensor
Directly replaces or cross-references 8 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Bosch — 15680Bosch — 15681Delphi — ES10914DENSO Auto Parts — 234-447375-347575-34761178751492611787514927