OE Quality
60-Day Returns

Walker 250-24718 Oxygen Sensor - Downstream
Overview of Walker 250-24718 Oxygen Sensor for Mazda 3
The Walker 250-24718 oxygen sensor is designed specifically for Mazda 3 models, providing precise emission control and engine performance monitoring. This heated oxygen sensor features a threaded mounting type and a radiused polygon female connector for secure installation.
- Wiring harness length: 28.07 inches
- Wire gauge measurement: 20 gauge
- Heated sensor type for faster response
- Specific fit for Mazda 3
- Four-wire configuration
- Radiused polygon female connector
- Thread diameter: 18.0 mm
- Overall length: 31.61 inches
- Threaded mounting type
Detailed Product Description
This Walker Products OE oxygen sensor (part number 250-24718) is engineered to meet the exact specifications of Mazda 3 vehicles. The heated sensor design allows for quicker activation and more accurate readings of exhaust oxygen levels, which is critical for optimal fuel mixture and emissions control. The four-wire setup includes both sensor and heater circuits, ensuring reliable operation under various engine conditions. The 18.0 mm threaded mounting and radiused polygon female connector provide a secure and precise fit, minimizing installation issues and ensuring consistent sensor performance.
Walker Products OE is a product line focused on delivering original equipment quality and fitment. This ensures that the 250-24718 oxygen sensor matches the factory specifications for Mazda 3 models, supporting proper engine management and emission system function.
Common Applications and Issues Addressed
- Replacement for faulty or failing oxygen sensors in Mazda 3
- Helps resolve rough idling and poor fuel economy
- Reduces engine hesitation and misfires related to oxygen sensor faults
- Supports emission system compliance and reduces exhaust emissions
- Prevents check engine light triggers related to oxygen sensor malfunction
Installation Notes and Tips
- Ensure vehicle compatibility with Mazda 3 models before installation
- Use appropriate tools for removing the threaded sensor to avoid damage
- Check wiring harness length (28.07 inches) for routing and connection clearance
- Verify connector type matches the vehicle’s female radiused polygon connector
- Follow torque specifications for the 18.0 mm threaded mounting to prevent leaks
Quality Assurance and Warranty
The Walker 250-24718 oxygen sensor is manufactured to meet stringent quality standards consistent with original equipment. Walker Products OE parts undergo rigorous testing to ensure durability and reliable performance in emission control systems. Warranty coverage details should be confirmed with the point of purchase or manufacturer documentation.
| Brand | Walker |
|---|---|
| Part Number | 250-24718 |
| Position | Walker Products OE, Downstream |
| Connector Gender | Female |
| Connector Shape | Radiused Polygon |
| Mounting Type | Threaded |
| Overall Length | 31.61 |
| Sensor Type | Heated |
| Thread Diameter | 18.0 |
| Universal Or Specific Fit | Specific |
| Wire Gauge Measurement | 20 |
| Wire Quantity | 4 |
| Wiring Harness Length | 28.07 |
This part fits 25 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2009 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Downstream oxygen sensor for B1S2, not for vehicles in California.; Walker Products OE |
| 2009 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Fits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products OE |
| 2009 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Downstream oxygen sensor for B1S2, not for vehicles in California.; Walker Products OE |
| 2009 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Downstream Bank 1 Sensor 2 for Non-Calif-ESV vehicles.; Walker Products OE |
| 2009 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Downstream Bank 1 Sensor 2 for Non-Calif-ESV vehicles.; Walker Products OE |
| 2009 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Downstream oxygen sensor for second bank, sensor 1, non-California emissions.; Walker Products OE |
| 2009 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Downstream oxygen sensor for second bank, sensor 1, non-California emissions.; Walker Products OE |
| 2008 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Downstream oxygen sensor for B1S2, not for vehicles in California.; Walker Products OE |
| 2008 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Non Calif-ESV; B1S3; No Calif-ESV; Downstream; Walker Products OE |
| 2008 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Downstream Bank 1 Sensor 2 for Non-Calif-ESV vehicles.; Walker Products OE |
| 2008 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Non-Calif-ESV/No Calif-ESV Downstream B1S3 Oxygen Sensor; Walker Products OE |
| 2008 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Downstream oxygen sensor for second bank, sensor 1, non-California emissions.; Walker Products OE |
| 2008 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Non Calif-ESV; B1S3; Downstream; Walker Products OE |
| 2007 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Downstream oxygen sensor for B1S2, not for vehicles in California.; Walker Products OE |
| 2007 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Downstream oxygen sensor for B1S2, not for vehicles in California.; Walker Products OE |
| 2007 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Downstream Bank 1 Sensor 2 for Non-Calif-ESV vehicles.; Walker Products OE |
| 2007 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Downstream Bank 1 Sensor 2 for Non-Calif-ESV vehicles.; Walker Products OE |
| 2007 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Downstream oxygen sensor for second bank, sensor 1, non-California emissions.; Walker Products OE |
| 2007 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Downstream oxygen sensor for second bank, sensor 1, non-California emissions.; Walker Products OE |
| 2006 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Downstream oxygen sensor for B1S2, not for vehicles in California.; Walker Products OE |
| 2006 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Downstream oxygen sensor for B1S2, not for vehicles in California.; Walker Products OE |
| 2006 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Downstream Bank 1 Sensor 2 for Non-Calif-ESV vehicles.; Walker Products OE |
| 2006 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Downstream Bank 1 Sensor 2 for Non-Calif-ESV vehicles.; Walker Products OE |
| 2006 | Mazda | 3 | 2.3L | L4 | GAS | Downstream | Downstream oxygen sensor for second bank, sensor 1, non-California emissions.; Walker Products OE |
| 2006 | Mazda | 3 | 2.0L | L4 | GAS | Downstream | Downstream oxygen sensor for second bank, sensor 1, non-California emissions.; Walker Products OE |
* 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.