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Walker 350-34404 Oxygen Sensor - Downstream Left
| Brand | Walker 350-34404 |
|---|---|
| Position | Downstream Left |
| Connector Gender | Male |
| Connector Shape | Radiused Polygon |
| Mounting Type | Threaded |
| Overall Length | 48.74 |
| Sensor Type | Heated |
| Thread Diameter | 18.0 |
| Universal Or Specific Fit | Specific |
| Wire Gauge Measurement | 20 |
| Wire Quantity | 4 |
| Wiring Harness Length | 45.2 |
| Product line | Walker Products Aftermarket |
| Fits | Nissan · 1 vehicle |
OE replacement. Engineered for specific application and ECU feedback.
Heated sensor. Helps maintain accurate diagnostic response.
Threaded mount. Installs with a secure, direct-fit connection.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Walker 350-34404 Oxygen Sensor for Pathfinder
Walker Products 350-34404 is a heated oxygen sensor built as a specific-fit OE replacement for the downstream left position on the 2003 Nissan Pathfinder. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions monitoring.
Key Features
- Specific-fit oxygen sensor for the downstream left location
- Heated sensor design for faster operating response
- 4-wire configuration with 20-gauge wiring
- Threaded mounting with 18.0 mm thread diameter
- Radiused polygon male connector for vehicle-specific connection
- Wiring harness length: 45.2; overall length: 48.74
Product Details
The Walker Products Aftermarket line focuses on engine management and oxygen/air-fuel sensors developed for OE-style replacement use. Part number 350-34404 is built for the 2003 Nissan Pathfinder downstream left oxygen sensor location and is intended to restore accurate exhaust feedback to the engine control unit. Walker Products 350-34404 is a direct-fit replacement for the specified application, with the correct connector style, harness length, and threaded mounting configuration for that position.
This sensor is used by the ECU to monitor exhaust oxygen content and support fuel trim adjustments. When the original sensor begins to fail, the vehicle may store fault codes and show drivability or emissions-related symptoms. Walker Products 350-34404 is a practical replacement for the 2003 Nissan Pathfinder when the downstream left oxygen sensor needs service.
What It Helps Address
- Check engine light related to the downstream oxygen sensor circuit
- Poor fuel economy caused by inaccurate exhaust feedback
- Rough engine operation tied to sensor signal issues
- Elevated exhaust emissions from a worn sensor
- Stored ECU fault codes for the affected sensor or related system
Installation Notes
Confirm the downstream left position before ordering and compare the connector, thread size, and harness routing to the original part. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation, since physical damage can shorten sensor life. This part cross-references Walker Products Aftermarket 350-34404 for the same application.
Quality Assurance
Walker Products has supplied engine management and fuel system components since 1946 and operates as an Automotive ISO9001/TS 16949 certified company. The 350-34404 oxygen sensor is manufactured for the specified vehicle application and fitment position to provide the ECU feedback required for proper operation.
| Year | Make | Model | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2003 | Nissan | Pathfinder | 3.5L | V6 | GAS | Downstream Left | Downstream left oxygen sensor required.; Walker Products Aftermarket |
| No rows match your filter. | |||||||