OE Quality
60-Day Returns

Walker 350-34246 Oxygen Sensor - Center or Downstream
Overview of Walker 350-34246 Oxygen Sensor for Mazda Vehicles
The Walker 350-34246 oxygen sensor is designed specifically for select Mazda models, including the Mazda 2, 3, and 6. This heated oxygen sensor ensures accurate emissions monitoring and optimal engine performance by providing precise air-fuel mixture data to the vehicle's engine control unit.
- Heated oxygen sensor with threaded mounting
- Specific fit for Mazda 2, 3, and 6 models
- 29.84-inch wiring harness length for flexible installation
- 20-gauge wire with 4-wire configuration
- Radiused polygon female connector for secure connection
- 18.0 mm thread diameter and 33.39-inch overall length
Detailed Product Features and Specifications
This Walker oxygen sensor (part number 350-34246) features a heated sensor element that allows for faster warm-up times and improved emissions control. The sensor is designed with a threaded mounting type and an 18.0 mm thread diameter, ensuring a secure and precise fit in the exhaust system. The wiring harness length of 29.84 inches provides ample reach for installation, while the 20-gauge wire and 4-wire configuration support reliable signal transmission and heater operation. The connector is a radiused polygon female type, engineered to match the original equipment specifications for Mazda 2, 3, and 6 models.
Walker Products Aftermarket Line Information
The Walker Products Aftermarket line offers replacement emission control components engineered to meet or exceed OEM standards. This oxygen sensor is part of that line, providing a direct-fit solution for Mazda vehicles that require precise sensor performance and durability. The aftermarket line focuses on delivering components that maintain vehicle emissions compliance and engine efficiency.
Common Applications and Problem Resolution
- Restores accurate oxygen sensing for proper air-fuel mixture control
- Resolves check engine light issues related to oxygen sensor faults
- Improves fuel economy by ensuring correct sensor feedback
- Reduces harmful emissions by maintaining proper sensor function
- Eliminates rough idling or engine hesitation caused by faulty sensors
Installation Notes and Tips
When installing the Walker 350-34246 oxygen sensor, ensure the vehicle is cool to avoid burns. Use appropriate tools to remove the old sensor and avoid damaging the wiring harness. Verify the connector type matches the vehicle’s harness before installation. Thread the sensor carefully to prevent cross-threading and torque to manufacturer specifications. The 29.84-inch wiring harness length allows for flexible routing during installation.
Quality Assurance and Warranty
Walker Products Aftermarket oxygen sensors are manufactured to meet strict quality standards for durability and performance. While specific warranty details for part number 350-34246 should be confirmed at the point of purchase, Walker typically offers limited warranties covering defects in materials and workmanship to ensure reliability in emission control applications.
| Brand | Walker |
|---|---|
| Part Number | 350-34246 |
| Position | Walker Products Aftermarket, Downstream |
| Connector Gender | Female |
| Connector Shape | Radiused Polygon |
| Mounting Type | Threaded |
| Overall Length | 33.39 |
| Sensor Type | Heated |
| Thread Diameter | 18.0 |
| Universal Or Specific Fit | Specific |
| Wire Gauge Measurement | 20 |
| Wire Quantity | 4 |
| Wiring Harness Length | 29.84 |
This part fits 54 vehicles. Search below:
| Year | Make | Model | Submodel | Transmission | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|---|---|
| 2017 | Mazda | 2 | 1.5L | L4 | GAS | Downstream | Fits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket | ||
| 2016 | Mazda | 2 | 1.5L | L4 | GAS | Downstream | Fits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket | ||
| 2015 | Mazda | 2 | 1.5L | L4 | GAS | Downstream | Fits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket | ||
| 2014 | Mazda | 2 | 1.5L | L4 | GAS | Downstream | Fits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket | ||
| 2013 | Mazda | 2 | 1.5L | L4 | GAS | Downstream | Fits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket | ||
| 2012 | Mazda | 2 | 1.5L | L4 | GAS | Downstream | Fits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket | ||
| 2011 | Mazda | 2 | 1.5L | L4 | GAS | Downstream | Fits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket | ||
| 2009 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Downstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket | ||
| 2009 | Mazda | 3 | 2.3L | L4 | GAS | Center | Calif-ESV, Center Oxygen Sensor; Walker Products Aftermarket | ||
| 2009 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Downstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket | ||
| 2009 | Mazda | 3 | 2.0L | L4 | GAS | Center | Calif-ESV, Center Oxygen Sensor; Walker Products Aftermarket | ||
| 2009 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Downstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket | ||
| 2009 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Downstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket | ||
| 2008 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Calif-ESV; B1S3; Downstream; Walker Products Aftermarket | ||
| 2008 | Mazda | 3 | 2.3L | L4 | GAS | Center | Calif-ESV; B1S2; Center; Walker Products Aftermarket | ||
| 2008 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Calif-ESV; B1S3; Downstream; Walker Products Aftermarket | ||
| 2008 | Mazda | 3 | 2.0L | L4 | GAS | Center | Non Calif-ESV; B1S2; No Calif-ESV; Center; Walker Products Aftermarket | ||
| 2008 | Mazda | 3 | 2.0L | L4 | GAS | Center | Calif-ESV; B1S2; Center; Walker Products Aftermarket | ||
| 2008 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Calif-ESV; Downstream; B1S3; Walker Products Aftermarket | ||
| 2008 | Mazda | 3 | 2.3L | L4 | GAS | Center | Calif-ESV Center Oxygen Sensor B1S2; Walker Products Aftermarket | ||
| 2008 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Calif-ESV; Downstream; B1S3; Walker Products Aftermarket | ||
| 2008 | Mazda | 3 | 2.0L | L4 | GAS | Center | Non-Calif-ESV, No Calif-ESV, Center, B1S2; Walker Products Aftermarket | ||
| 2008 | Mazda | 3 | 2.0L | L4 | GAS | Center | Calif-ESV Center Oxygen Sensor B1S2; Walker Products Aftermarket | ||
| 2008 | Mazda | 3 | 2.0L | L4 | GAS | Center | Non Calif-ESV; B1S2; Center; Walker Products Aftermarket | ||
| 2008 | Mazda | 6 | Automatic | 2.3L | L4 | GAS | Downstream | Downstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket | |
| 2008 | Mazda | 6 | Automatic | 2.3L | L4 | GAS | Downstream | Downstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket | |
| 2007 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Calif-ESV; B1S3; Downstream; Walker Products Aftermarket | ||
| 2007 | Mazda | 3 | 2.3L | L4 | GAS | Center | Calif-ESV; B1S2; Center; Walker Products Aftermarket | ||
| 2007 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Calif-ESV; B1S3; Downstream; Walker Products Aftermarket | ||
| 2007 | Mazda | 3 | 2.0L | L4 | GAS | Center | Calif-ESV; B1S2; Center; Walker Products Aftermarket | ||
| 2007 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Calif-ESV; Downstream; B1S3; Walker Products Aftermarket | ||
| 2007 | Mazda | 3 | 2.3L | L4 | GAS | Center | Calif-ESV Center Oxygen Sensor B1S2; Walker Products Aftermarket | ||
| 2007 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Calif-ESV; Downstream; B1S3; Walker Products Aftermarket | ||
| 2007 | Mazda | 3 | 2.0L | L4 | GAS | Center | Calif-ESV Center Oxygen Sensor B1S2; Walker Products Aftermarket | ||
| 2007 | Mazda | 6 | Automatic | 2.3L | L4 | GAS | Downstream | Downstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket | |
| 2007 | Mazda | 6 | Automatic | 2.3L | L4 | GAS | Downstream | Downstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket | |
| 2006 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Calif-ESV; B1S3; Downstream; Walker Products Aftermarket | ||
| 2006 | Mazda | 3 | 2.3L | L4 | GAS | Center | Calif-ESV; B1S2; Center; Walker Products Aftermarket | ||
| 2006 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Calif-ESV; B1S3; Downstream; Walker Products Aftermarket | ||
| 2006 | Mazda | 3 | 2.0L | L4 | GAS | Center | Calif-ESV; B1S2; Center; Walker Products Aftermarket | ||
| 2006 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Calif-ESV; Downstream; B1S3; Walker Products Aftermarket | ||
| 2006 | Mazda | 3 | 2.3L | L4 | GAS | Center | Calif-ESV Center Oxygen Sensor B1S2; Walker Products Aftermarket | ||
| 2006 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Calif-ESV; Downstream; B1S3; Walker Products Aftermarket | ||
| 2006 | Mazda | 3 | 2.0L | L4 | GAS | Center | Calif-ESV Center Oxygen Sensor B1S2; Walker Products Aftermarket | ||
| 2006 | Mazda | 6 | i | Automatic | 2.3L | L4 | GAS | Downstream | Calif-ESV; B1S3; Downstream; Walker Products Aftermarket |
| 2006 | Mazda | 6 | i | Automatic | 2.3L | L4 | GAS | Downstream | Calif-ESV; Downstream; B1S3; Walker Products Aftermarket |
| 2005 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Calif-ESV; B1S3; Downstream; Walker Products Aftermarket | ||
| 2005 | Mazda | 3 | 2.0L | L4 | GAS | Center | Calif-ESV; B1S2; Center; Walker Products Aftermarket | ||
| 2005 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Calif-ESV; Downstream; B1S3; Walker Products Aftermarket | ||
| 2005 | Mazda | 3 | 2.0L | L4 | GAS | Center | Calif-ESV Center Oxygen Sensor B1S2; Walker Products Aftermarket | ||
| 2004 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Calif-ESV; B1S3; Downstream; Walker Products Aftermarket | ||
| 2004 | Mazda | 3 | 2.0L | L4 | GAS | Center | Calif-ESV; B1S2; Center; Walker Products Aftermarket | ||
| 2004 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Calif-ESV; Downstream; B1S3; Walker Products Aftermarket | ||
| 2004 | Mazda | 3 | 2.0L | L4 | GAS | Center | Calif-ESV Center Oxygen Sensor B1S2; Walker Products Aftermarket |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.