Walker 350-34510 Oxygen Sensor - Downstream, Downstream Rear or Upstream

OE Replacement Oxygen Sensor

Walker Products 350-34510 is a heated oxygen sensor built as a specific-fit replacement for select Mazda applications. It is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring, including downstream and upstream positions where listed.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for OE-style replacement needs. The 350-34510 follows the application-specific approach used across the line, with fitment matched to the vehicle position and connector requirements.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fit design for direct application matching
• 4-wire configuration with 20-gauge wiring
• Radiused polygon male connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 13.31 in.
• Overall length: 16.85 in.

Detailed Description

This Walker oxygen sensor, part number 350-34510, is designed for Mazda vehicles that require a direct replacement sensor in the correct upstream or downstream location. It supports ECU feedback for air-fuel management and emissions control, helping maintain accurate sensor input when the original unit has aged or failed. Confirm the sensor position before ordering, since this application includes downstream, downstream rear, and upstream fitments.

Compatible With: 2012-2013 Mazda 3 downstream, 2012-2013 Mazda 3 Sport downstream, 2003-2005 Mazda 6 downstream rear, and 1990-1991 Mazda 929 upstream. This part number 350-34510 is also referenced for Mazda 3 and Mazda 6 oxygen sensor replacement searches.

Common Issues This Part May Address

• Check engine light or malfunction indicator light related to oxygen sensor faults
• Poor engine performance caused by inaccurate exhaust feedback
• Increased fuel consumption from incorrect air-fuel correction
• Higher exhaust emissions from a degraded sensor signal
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes

• Verify the exact position before installation: downstream, downstream rear, or upstream.
• Inspect the sensor wiring harness and connector for physical damage before replacement.
• Check the threaded mounting location for contamination or thread damage.
• Use the vehicle’s OE-style connector and harness routing as a reference during installation.
• Confirm application details for Mazda 3, Mazda 3 Sport, Mazda 6, or Mazda 929 before purchase.

Quality Assurance

Walker Products has produced engine management components since 1946 and operates as an ISO 9001 / TS 16949 certified company. The 350-34510 is built as an OE replacement oxygen sensor for the listed Mazda applications and position-specific fitment.