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Walker 350-34391 Oxygen Sensor - Downstream
| Brand | Walker 350-34391 |
|---|---|
| Position | Downstream |
| Connector Gender | Male |
| Connector Shape | Radiused Polygon |
| Mounting Type | Threaded |
| Overall Length | 29.65 |
| Sensor Type | Heated |
| Thread Diameter | 18.0 |
| Universal Or Specific Fit | Specific |
| Wire Gauge Measurement | 20 |
| Wire Quantity | 4 |
| Wiring Harness Length | 26.1 |
| Product line | Walker Products Aftermarket |
| Fits | Mazda · 3 vehicles |
OE replacement. Engineered as an original-equipment-style oxygen sensor.
Heated sensor. Helps deliver faster feedback to the ECU.
Threaded mount. Installs with a secure, direct-fit connection.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Walker 350-34391 Oxygen Sensor for Mazda CX-7
Walker Products 350-34391 is a specific-fit heated oxygen sensor engineered as an OE-style replacement for select 2010-2012 Mazda CX-7 applications. It is built to deliver the ECU feedback needed for proper fuel control and emissions monitoring on the downstream bank 1 sensor 2 position.
Key Features
- Heated oxygen sensor for downstream exhaust monitoring
- Specific fit for select Mazda CX-7 models
- 4-wire design with a male radiused polygon connector
- Threaded mounting with 18.0 mm thread diameter
- 26.1 in. wiring harness length and 20-gauge wire
- Overall length: 29.65 in.
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 350-34391 is intended for the downstream bank 1 sensor 2 location on 2010-2012 Mazda CX-7 models, where accurate exhaust oxygen readings help the engine control module manage air-fuel strategy and emissions system operation. If the sensor begins to fail, the vehicle may store fault codes and show drivability or emissions-related symptoms. Walker 350-34391 is a direct-fit replacement for the listed Mazda CX-7 coverage and is designed around the connector, harness, and mounting details required by that application.
What It May Help Resolve
- Check engine light related to downstream oxygen sensor performance
- Stored ECU fault codes tied to bank 1 sensor 2
- Poor fuel economy caused by inaccurate exhaust feedback
- Rough engine operation linked to emissions sensor issues
- Elevated exhaust emissions from a failing oxygen sensor
Installation Notes and Tips
Confirm the connector shape, thread diameter, harness length, and sensor position before installation. For 2010-2012 Mazda CX-7 service, verify that the replacement matches the downstream bank 1 sensor 2 location. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten sensor life and affect readings.
Quality Assurance
Walker Products has manufactured engine management components since 1946 and operates with ISO 9001/TS 16949 quality systems. The 350-34391 oxygen sensor is built as a specific-application replacement for consistent fitment and diagnostic feedback on the listed Mazda CX-7 models.
| Year | Make | Model | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2012 | Mazda | CX-7 | 2.5L | L4 | GAS | Downstream | Fits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket |
| 2011 | Mazda | CX-7 | 2.5L | L4 | GAS | Downstream | Fits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket |
| 2010 | Mazda | CX-7 | 2.5L | L4 | GAS | Downstream | Fits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket |
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