Walker 350-35138 Oxygen Sensor - Upstream or Upstream Right

OE Replacement Oxygen Sensor for Mazda and Ford

Walker OE Replacement oxygen sensor 350-35138 is a specific-fit, heated wide-band sensor built for direct replacement in select Mazda and Ford applications. It delivers the ECU feedback needed for accurate air-fuel control, helping maintain proper engine operation and emissions performance.

The Walker OE Replacement line focuses on application-specific fitment and sensor position, so this part is matched to the vehicle’s upstream location and connector style. For drivers searching for an upstream air-fuel ratio sensor for Mazda CX-9 or a Ford Mustang upstream right oxygen sensor, 350-35138 provides an OE-style replacement solution.

Key Features

• Heated wide-band oxygen sensor for precise exhaust feedback
• Specific fit for the listed vehicle applications and positions
• Standard replacement grade for OE-style service
• 5-wire design with oblong connector and male spade terminals
• M18 x 1.5 threaded mounting for direct installation in the correct bung
• 20-gauge wiring and 328 mm overall length
• Walker OE Replacement part number 350-35138

Detailed Description

Walker Products designs its engine management and oxygen/air-fuel sensors as OE replacement components for global vehicle applications. This sensor is engineered for the specific fitment position and diagnostic feedback expected by the ECU, making it a practical choice when replacing a failed upstream sensor. The Walker OE Replacement product line is built around application-specific coverage, helping ensure the sensor matches the vehicle’s original configuration rather than relying on a universal design.

This part number 350-35138 is listed for 2011-2015 Mazda CX-9 upstream, 2011-2013 Mazda 6 upstream, 2011 Ford Mustang upstream right to 02/03/2011, and 2010-2011 Mazda Tribute upstream. It is a heated wide-band sensor with a threaded mount, 22 mm wrench size, and oblong connector shape.

What It Helps Address

• Check engine light related to upstream oxygen or air-fuel sensor faults
• Rough engine operation caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate sensor readings
• Elevated exhaust emissions from poor mixture control
• Diagnostic trouble codes stored in the ECU for sensor-related issues

Installation Notes and Tips

Before replacement, inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear. Confirm the vehicle’s exact year, model, and sensor position before ordering, since this part is specific to upstream and upstream right applications only. Use the correct 22 mm wrench size and verify the M18 x 1.5 thread engagement during installation.

For fitment searches, this part is commonly referenced for Mazda CX-9 upstream air-fuel ratio sensor replacement, Mazda 6 upstream oxygen sensor replacement, and Ford Mustang upstream right sensor replacement. The part number 350-35138 should be matched to the listed application before service.

Quality Assurance

Walker Products has manufactured engine management and oxygen sensor components since 1946 and operates as an ISO 9001/TS 16949 certified company. The OE Replacement line is developed to meet the application-specific requirements of the vehicle’s emissions and diagnostic system.