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Walker 350-64066 Oxygen Sensor - Upstream
| Brand | Walker 350-64066 |
|---|---|
| Position | Upstream |
| Connector Gender | Female |
| Connector Shape | Radiused Polygon |
| Mounting Type | Threaded |
| Overall Length | 25.71 |
| Sensor Type | Heated |
| Thread Diameter | 18.0 |
| Universal Or Specific Fit | Specific |
| Wire Gauge Measurement | 20 |
| Wire Quantity | 4 |
| Wiring Harness Length | 22.17 |
| Product line | Walker Products Aftermarket |
| Fits | Mazda · 2 vehicles |
OE replacement. Engineered as an original-equipment-style sensor for reliable diagnostic feedback.
Heated sensor. Helps the engine management system reach operating temperature faster.
Threaded mount. Installs with a secure, direct-fit threaded connection.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Walker 350-64066 Oxygen Sensor for Mazda 6
Walker Products 350-64066 is a heated oxygen sensor built as a specific-fit OE replacement for the upstream position on select 2005 Mazda 6 California emissions ESV vehicles. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions monitoring.
Key Features
- Specific-fit heated oxygen sensor for the upstream location
- Fits 2005 Mazda 6, upstream
- 4-wire design with 20-gauge wiring
- Female connector with radiused polygon shape
- Threaded mounting with 18.0 mm thread diameter
- Wiring harness length: 22.17 in.; overall length: 25.71 in.
- Walker Products Aftermarket part number 350-64066
Product Details
Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built for application-specific fitment and ECU feedback requirements. Part number 350-64066 is made for the upstream oxygen sensor position on the 2005 Mazda 6 with California emissions ESV coverage, making it a direct-match option for vehicles that need a heated sensor in this location. This part number 350-64066 is also listed for the 2005 Mazda 6 upstream oxygen sensor application.
This sensor is used in emissions control and fuel-trim monitoring, where accurate exhaust-gas feedback helps the engine computer adjust air-fuel delivery. The threaded, specific-fit design and connector configuration support proper replacement on the intended Mazda 6 application.
What It Helps Address
- Check engine light related to upstream oxygen sensor faults
- Poor fuel economy caused by incorrect exhaust feedback
- Rough engine operation from inaccurate air-fuel correction
- Higher exhaust emissions from a failing sensor
- Stored ECU fault codes tied to the oxygen sensor circuit
Installation Notes
Confirm the vehicle is a 2005 Mazda 6 with California emissions ESV coverage and verify the upstream sensor location before installation. Inspect the sensor wiring harness and connector for damage, since physical wear can shorten service life and affect operation. Match the threaded mounting and connector style to the original part for proper fitment.
Quality Assurance
Walker Products has produced engine management components since 1946 and operates as an Automotive ISO 9001/TS 16949 certified company. Its oxygen and air-fuel sensors are developed as OE-style replacements for specific vehicle applications, including the Mazda 6 upstream oxygen sensor fitment covered by part number 350-64066.
| Year | Make | Model | Transmission | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|---|
| 2005 | Mazda | 6 | Automatic | 2.3L | L4 | GAS | Upstream | Compatible with California-ESV vehicles, Upstream Oxygen Sensor; Walker Products Aftermarket |
| 2005 | Mazda | 6 | Automatic | 2.3L | L4 | GAS | Upstream | California emissions ESV vehicles oxygen sensor; Walker Products Aftermarket |
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