OE Quality
60-Day Returns

Walker 350-31025 Oxygen Sensor - Upstream
Overview of Walker Oxygen Sensor 350-31025 for Mazda Miata
The Walker 350-31025 oxygen sensor is designed specifically for Mazda Miata models, providing precise emission control sensor functionality. This non-heated oxygen sensor features a threaded mounting type and a radiused polygon female connector, ensuring a secure and accurate fit.
- Wiring harness length: 19.41 inches
- Wire gauge measurement: 20 gauge
- Sensor type: Non-heated oxygen sensor
- Specific fit for Mazda Miata
- Connector shape: Radiused polygon, female gender
- Thread diameter: 18.0 mm
- Overall length: 22.95 inches
- Mounting type: Threaded
- Single wire configuration
Detailed Product Description
This Walker Products Aftermarket oxygen sensor (part number 350-31025) is engineered to meet the exact specifications required for Mazda Miata vehicles. The sensor’s non-heated design utilizes a single 20-gauge wire with a 19.41-inch wiring harness, allowing for straightforward installation and reliable signal transmission. The radiused polygon female connector ensures compatibility with the vehicle’s existing wiring harness, while the 18.0 mm threaded mounting provides a secure and leak-free fit. With an overall length of 22.95 inches, this sensor is designed to fit precisely in the designated emission control system location.
Walker Products Aftermarket Line Information
The Walker Products Aftermarket line focuses on providing replacement emission control components that meet or exceed OEM standards. This oxygen sensor is part of that line, offering a specific fit and reliable performance for Mazda Miata owners seeking a direct replacement sensor that integrates seamlessly with their vehicle’s emission system.
Common Applications and Issues Addressed
- Restores accurate oxygen level readings for optimal engine performance
- Helps resolve check engine light triggers related to oxygen sensor faults
- Improves fuel efficiency by ensuring proper air-fuel mixture monitoring
- Reduces harmful emissions by maintaining correct sensor operation
- Prevents drivability issues caused by faulty or failing oxygen sensors
Installation Notes and Tips
- Ensure the vehicle is cool before sensor removal to avoid burns
- Use appropriate oxygen sensor socket for threaded installation
- Verify connector compatibility with the radiused polygon female plug
- Do not over-tighten the 18.0 mm threaded sensor to prevent damage
- Check wiring harness routing to avoid contact with hot or moving parts
Quality Assurance and Warranty
Walker Products Aftermarket oxygen sensors are manufactured to meet stringent quality standards, ensuring durability and reliable performance. While specific warranty details for part number 350-31025 may vary, Walker typically offers coverage against defects in materials and workmanship. Refer to the product documentation or manufacturer for exact warranty terms.
| Brand | Walker |
| Part Number | 350-31025 |
| Position | Walker Products Aftermarket, Upstream |
| Connector Gender | Female |
| Connector Shape | Radiused Polygon |
| Mounting Type | Threaded |
| Overall Length | 22.95 |
| Sensor Type | Non Heated |
| Thread Diameter | 18.0 |
| Universal Or Specific Fit | Specific |
| Wire Gauge Measurement | 20 |
| Wire Quantity | 1 |
| Wiring Harness Length | 19.41 |
This part fits 8 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|
| 1993 | Mazda | Miata | 1.6L | L4 | GAS | Upstream | Bank 1 Sensor 1 needs an upstream oxygen sensor.; Walker Products Aftermarket |
| 1993 | Mazda | Miata | 1.6L | L4 | GAS | Upstream | Front oxygen sensor compatible with various vehicle models.; Walker Products Aftermarket |
| 1992 | Mazda | Miata | 1.6L | L4 | GAS | Upstream | Bank 1 Sensor 1 needs an upstream oxygen sensor.; Walker Products Aftermarket |
| 1992 | Mazda | Miata | 1.6L | L4 | GAS | Upstream | Front oxygen sensor compatible with various vehicle models.; Walker Products Aftermarket |
| 1991 | Mazda | Miata | 1.6L | L4 | GAS | Upstream | Bank 1 Sensor 1 needs an upstream oxygen sensor.; Walker Products Aftermarket |
| 1991 | Mazda | Miata | 1.6L | L4 | GAS | Upstream | Front oxygen sensor compatible with various vehicle models.; Walker Products Aftermarket |
| 1990 | Mazda | Miata | 1.6L | L4 | GAS | Upstream | Bank 1 Sensor 1 needs an upstream oxygen sensor.; Walker Products Aftermarket |
| 1990 | Mazda | Miata | 1.6L | L4 | GAS | Upstream | Front oxygen sensor compatible with various vehicle models.; 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.