Walker 350-34264 Oxygen Sensor - Upstream

Walker 350-34264 Oxygen Sensor Overview

Walker Products 350-34264 is a heated oxygen sensor built as a specific-fit OE replacement for select applications. It is engineered for upstream placement and provides the ECU with the feedback needed to monitor air-fuel control on vehicles such as the Chevrolet Astra.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for direct replacement use, with application-specific fitment and connector design. For 2004-2008 Chevrolet Astra upstream oxygen sensor service, this part number is built to match the required position and signal needs.

Key Features

• Part number: 350-34264
• Heated oxygen sensor design
• Specific fit for the listed application
• 4-wire configuration with female connector
• 11.34 in. wiring harness length
• 18.00 mm thread diameter
• 14.88 in. overall length
• 22-gauge wire construction
• Upstream sensor position

Detailed Description

The Walker Products 350-34264 oxygen sensor is intended for upstream exhaust monitoring where the ECU relies on accurate exhaust-gas feedback to manage fuel delivery and emissions control. Its heated design helps the sensor reach operating temperature faster, which is important for stable signal output during cold starts and normal driving. This part is a direct-fit style replacement for the Chevrolet Astra and other listed applications, with the connector, harness length, and thread size matched to the vehicle-specific installation point.

Walker Products Aftermarket builds engine management sensors to OE-style application requirements, and the 350-34264 follows that approach for the Chevrolet Astra upstream oxygen sensor location. If the original sensor has triggered a fault code, caused poor running, increased fuel use, higher emissions, or illuminated the MIL, replacing the sensor with the correct application-specific part can restore proper feedback to the ECU.

What It Helps Address

• Check engine light related to upstream oxygen sensor performance
• Rough engine operation caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate exhaust readings
• Elevated exhaust emissions from a failing sensor
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes

Verify the vehicle uses the upstream position before installation. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten sensor life and affect signal quality. Confirm thread diameter, wire count, connector gender, and harness length against the original part before installation. Fits 2004-2008 Chevrolet Astra, upstream. Fits 2004-2008 Chevrolet Astra, front oxygen sensor location as listed in the application data.

Quality Assurance

Walker Products states that its engine management sensors are developed as OE replacement parts and manufactured under Automotive ISO9001/TS 16949 quality systems. Since 1946, the brand has supplied oxygen and air-fuel sensors for vehicle service applications, including the Walker Products Aftermarket line.