Walker 350-34077 Oxygen Sensor - Downstream

Walker 350-34077 Oxygen Sensor Overview

Walker Products 350-34077 is a heated oxygen sensor built as a specific-fit OE replacement for select Chevrolet and Pontiac applications. It is engineered to provide the ECU with the exhaust feedback needed for proper fuel control and emissions monitoring.

Compatible with 2002-2005 Chevrolet Cavalier, downstream; 2005 Pontiac Grand Am, downstream; and 2002-2005 Pontiac Sunfire, downstream.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific-fit design for the listed vehicle applications
• 4-wire configuration with 20-gauge wiring
• Radiused polygon male connector for application-specific connection
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 46.77 in.; overall length: 50.31 in.

Application Details

This Walker Products Aftermarket sensor line is developed for engine management and oxygen/air-fuel sensor replacement needs across a wide range of vehicles. Part number 350-34077 is intended for downstream use on the listed Chevrolet Cavalier, Pontiac Grand Am, and Pontiac Sunfire models, where accurate exhaust feedback helps the ECU manage fuel delivery and emissions strategy. If the original sensor is failing, the vehicle may store fault codes and show drivability or emissions-related symptoms.

This part cross-references no listed interchange numbers in the provided data.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Poor fuel economy caused by incorrect exhaust feedback
• Rough engine operation tied to sensor signal issues
• Elevated exhaust emissions from inaccurate air-fuel monitoring
• Stored ECU fault codes associated with the affected sensor circuit

Installation Notes

Verify the connector shape, wire count, thread diameter, and downstream position before installation. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear, since damaged wiring can shorten sensor life and affect signal quality. Confirm the vehicle application by year, make, model, and sensor location before ordering.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and manufactures this oxygen sensor as an OE-style replacement for the specified application. The company is ISO 9001/TS 16949 certified, with production focused on application-specific fitment and ECU feedback requirements.