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NTK
Direct Fit Oxygen SensorNTK 21531 Oxygen Sensor - Downstream or Downstream Left
| Brand | NTK 21531 |
|---|---|
| Position | Downstream and Downstream Left |
| Wiring Harness Length | 41.2500 |
| 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 | Saab, Saturn, and Volvo · 43 vehicles |
Direct fit design. Specific application replacement for a precise OE-style installation.
Heated sensor. Built for faster operating response in emissions monitoring systems.
OE specification testing. Manufactured and tested to meet or exceed original equipment standards.
Cross-references BBB Industries 16175, Bosch 16064 and Bosch 16200 for the same application. See all 27.
$93.81Free shipping
In stock · usually ships same day before 1pm CST
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Step 2 — Quantity
$93.81
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Free returns within 60 days if it doesn't fit when fitment is verified.
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Direct Fit Oxygen Sensor Overview
NTK 21531 is a direct fit heated oxygen sensor built for specific downstream applications. It uses a threaded mounting design, a 4-wire configuration, and a 41.25-inch harness for a precise replacement on supported Saab, Saturn, and Volvo vehicles.
Key Features
- Direct fit, specific application oxygen sensor
- Heated sensor design for faster operating response
- 4-wire construction with 41.25-inch wiring harness
- Threaded mounting with 18 mm thread diameter
- OE-equivalent design for downstream emissions monitoring
Fitment Details
Compatible with downstream applications on select Saab, Saturn, and Volvo models. Fits 2000-2011 Saab 9-3, Downstream. Fits 2010-2011 Saab 9-3X, Downstream. Fits 2000-2010 Saab 9-5, Downstream. Fits 2001-2005 Saturn L300, Downstream Left. Fits 2001-2003 Saturn LW300, Downstream Left. Fits 2000-2002 Volvo S80, Downstream. Fits 2000-2001 Volvo S80, Downstream. Fits 2000 Saturn LS2, Downstream Left. Fits 2000 Saturn LW2, Downstream Left. NTK 21531 is also listed for additional downstream fitments across the same vehicle families.
What It Helps Address
- Faulty downstream oxygen sensor readings
- Check engine lights related to emissions monitoring
- Incorrect air-fuel feedback after catalyst operation
- Sensor response issues caused by worn heating elements
- Replacement needs for threaded OE-style sensor locations
Installation Notes
Confirm the connector style, wire count, thread diameter, and downstream position before installation. Match the application exactly to the vehicle and engine configuration listed in the fitment data. NTK 21531 is a specific-fit replacement, so correct vehicle identification is important before ordering.
Quality Assurance
NTK is part of the NGK family of products and is recognized as a major original equipment oxygen sensor supplier. The sensor is manufactured and tested to meet or exceed OE specifications for fit, form, and function. Part number 21531 cross-references Bosch 16064 and DENSO Auto Parts 234-4822 for the same application.
This part fits 43 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
| Year | Make | Model | Body Type | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2011 | Saab | 9-3 | — | 2.0L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2011 | Saab | 9-3X | — | 2.0L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2010 | Saab | 9-3 | — | 2.0L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2010 | Saab | 9-3X | — | 2.0L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2010 | Saab | 9-5 | — | 2.8L | V6 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2009 | Saab | 9-3 | — | 2.0L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2009 | Saab | 9-5 | — | 2.3L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2008 | Saab | 9-3 | — | 2.0L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2008 | Saab | 9-5 | — | 2.3L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2007 | Saab | 9-3 | — | 2.0L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2007 | Saab | 9-5 | — | 2.3L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2006 | Saab | 9-3 | — | 2.0L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2006 | Saab | 9-5 | — | 2.3L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2005 | Saab | 9-3 | — | 2.0L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2005 | Saab | 9-5 | — | 2.3L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2005 | Saturn | L300 | — | 3.0L | V6 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2004 | Saab | 9-3 | — | 2.0L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2004 | Saab | 9-5 | — | 2.3L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2004 | Saturn | L300 | — | 3.0L | V6 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2003 | Saab | 9-3 | Convertible | 2.0L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2003 | Saab | 9-5 | — | 2.3L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2003 | Saturn | L300 | — | 3.0L | V6 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2003 | Saturn | LW300 | — | 3.0L | V6 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2002 | Saab | 9-3 | — | 2.3L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2002 | Saab | 9-3 | — | 2.0L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2002 | Saab | 9-5 | — | 2.3L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2002 | Saturn | L300 | — | 3.0L | V6 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2002 | Saturn | LW300 | — | 3.0L | V6 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2002 | Volvo | S80 | — | 2.9L | L6 | Downstream | Cyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2001 | Saab | 9-3 | — | 2.3L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2001 | Saab | 9-3 | — | 2.0L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2001 | Saab | 9-5 | — | 2.3L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2001 | Saturn | L300 | — | 3.0L | V6 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2001 | Saturn | LW300 | — | 3.0L | V6 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2001 | Volvo | S80 | — | 2.9L | L6 | Downstream | Cyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2001 | Volvo | S80 | — | 2.9L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| 2000 | Saab | 9-3 | — | 2.3L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2000 | Saab | 9-3 | — | 2.0L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2000 | Saab | 9-5 | — | 2.3L | L4 | Downstream | Downstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor |
| 2000 | Saturn | LS2 | — | 3.0L | V6 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2000 | Saturn | LW2 | — | 3.0L | V6 | Downstream Left | Oxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor |
| 2000 | Volvo | S80 | — | 2.9L | L6 | Downstream | Cyls. 4-6; B2S2; OE Equivalent Design; Direct Fit Oxygen Sensor |
| 2000 | Volvo | S80 | — | 2.9L | L6 | Downstream | Cylinders 1-3 downstream oxygen sensor equivalent to OE design.; Direct Fit Oxygen Sensor |
| No rows match your filter. | |||||||
Directly replaces or cross-references 27 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
BBB Industries — 16175Bosch — 16064Bosch — 16200Bosch — 16624Delphi — ES20115DENSO Auto Parts — 234-4822DENSO Auto Parts — 234-4910DENSO Auto Parts — 234-4913Walker Exhaust — 1644775-271475-272975-273575-3554213-3010234-4867457091786701309182000947001155353149ES10732OS1827OS1844OS2359SG1073SG1090SG1526