Walker 350-34323 Oxygen Sensor - Downstream Left or Downstream Right

Walker 350-34323 Oxygen Sensor for Nissan Sentra

Walker Products 350-34323 is a heated oxygen sensor built as a specific-fit OE-style replacement for select 2000-2001 Nissan Sentra applications. It is engineered to provide the ECU with the feedback needed for downstream fuel control and emissions monitoring.

For Nissan Sentra owners diagnosing a check engine light, poor fuel economy, or elevated exhaust emissions, this downstream oxygen sensor is matched to the listed left- and right-side positions by model year and emissions configuration.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific-fit design for listed Nissan Sentra applications
• 4-wire configuration with 20-gauge wiring
• Threaded mounting type with 18.0 mm thread diameter
• Radiused polygon male connector for vehicle-specific connection
• Wiring harness length: 28.27 in.; overall length: 31.81 in.

Application Details

Fits 2001 Nissan Sentra, downstream left, excluding CA Series and without Mid Year Emissions. Fits 2000 Nissan Sentra, downstream left and downstream right, non-California emissions models. Walker Products Aftermarket part number 350-34323 is listed for these exact positions and emissions configurations.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered as replacement parts for original equipment applications. This part number 350-34323 follows that approach with application-specific fitment, connector style, and sensor feedback requirements for the ECU. This part cross-references no additional part numbers in the provided data.

What This Sensor Helps Address

• Check engine light related to downstream oxygen sensor performance
• Poor fuel economy caused by incorrect exhaust feedback
• Increased exhaust emissions from a failing sensor
• Rough engine operation tied to sensor signal issues
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes and Tips

Verify the vehicle’s emissions package, model year, and sensor position before ordering. Confirm the connector shape, wire count, and threaded mounting location against the original sensor. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation, since physical damage can shorten service life and affect signal quality.

Quality Assurance

Walker Products is an automotive ISO 9001/TS 16949 certified company with a long history in engine management and fuel system components. The 350-34323 oxygen sensor is built for the specified application and position to support proper ECU feedback on the listed Nissan Sentra models.