Walker 350-34403 Oxygen Sensor - Downstream or Upstream

Walker 350-34403 Oxygen Sensor for Honda and Acura

Walker Products 350-34403 is a heated oxygen sensor built as a specific-fit OE replacement for select Honda and Acura applications. It is engineered to provide the ECU with the diagnostic feedback needed for proper fuel control and emissions monitoring.

• Heated oxygen sensor for emissions and engine management systems
• Specific-fit design for the listed vehicle positions
• 4-wire configuration with female connector
• Threaded mounting type with 18.0 mm thread diameter
• Wiring harness length: 16.26; overall length: 19.8
• Connector shape: radiused polygon
• Wire gauge: 20

Walker Products Aftermarket Line

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered for OE-style replacement use. The 350-34403 follows that approach with application-specific fitment and sensor feedback intended to match the vehicle’s original diagnostic requirements.

Fitment Details

• Fits 2003 Acura EL, downstream. Fits downstream bank 1 sensor 2 on specific vehicle models.
• Fits 1990-1993 Honda Accord, upstream. Bank 1 Sensor 1 needs an upstream oxygen sensor.
• Fits 1990-1993 Honda Accord, upstream. Front oxygen sensor compatible with various vehicle models.
• Fits 1992-1993 Honda Prelude, upstream. Bank 1 Sensor 1 needs an upstream oxygen sensor.
• Fits 1992-1993 Honda Prelude, upstream. Front oxygen sensor compatible with various vehicle models.

What This Sensor Helps Address

• Check engine light or MIL illumination tied to oxygen sensor faults
• Poor engine performance caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate exhaust readings
• Higher exhaust emissions from a failing upstream or downstream sensor
• Stored ECU fault codes related to the affected sensor circuit

Installation Notes

Confirm the sensor position before installation: this part is listed for upstream and downstream applications depending on the vehicle. Inspect the sensor, wiring harness, and connector for physical damage before replacement, since damaged wiring can shorten service life and affect ECU feedback. Verify thread size, connector shape, and harness routing against the original part before installation.

Quality Assurance

Walker Products is an automotive ISO 9001/TS 16949 certified company with a long history in engine management components. Part number 350-34403 is manufactured for the specified application and position to support the vehicle’s diagnostic system requirements.