Walker 350-34988 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

OE Replacement Oxygen Sensor for GM Applications

Walker OE Replacement oxygen sensor 350-34988 is a specific-fit, heated narrow-band sensor built for direct replacement in select Cadillac, Chevrolet, and GMC applications. It provides the ECU with the feedback needed for fuel control and emissions monitoring, making it a practical choice when diagnosing a check engine light, poor drivability, or elevated fuel use.

Walker Products has engineered this sensor line as an OE-style replacement for application-specific fitment and signal output. The 350-34988 uses a 4-wire design, threaded M18 x 1.5 mounting, oblong connector shape, and a 425 mm wiring harness length for the listed upstream positions.

Key Features

• Heated narrow-band oxygen sensor for upstream engine management feedback
• Specific-fit design for the listed Cadillac, Chevrolet, and GMC vehicles
• 4-wire configuration with blade terminals and male terminal gender
• Threaded mounting with M18 x 1.5 thread size and 22 mm wrench size
• Overall length: 433 mm; wiring harness length: 425 mm
• Standard replacement grade for OE-style service work

Detailed Description

This Walker oxygen sensor is intended for upstream left, upstream right, and upstream positions shown in the fitment data, including applications such as Chevrolet Silverado 1500, GMC Sierra 1500, and Cadillac Escalade. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper air-fuel control and emissions system operation. For shoppers searching for a Walker 350-34988 oxygen sensor or an OE replacement oxygen sensor for Chevrolet Silverado 1500 upstream right, this part matches the listed vehicle-specific applications.

Walker Products has supplied engine management and oxygen/air-fuel sensors since 1946 and manufactures this line under ISO 9001/TS 16949 quality systems. This part cross-references common OE-style replacement needs for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by incorrect air-fuel feedback
• Rough running or hesitation from inaccurate sensor input
• Higher exhaust emissions from a failing upstream sensor
• Fault codes stored in the ECU for sensor or related system issues

Installation Notes and Tips

Confirm the exact year, make, model, and sensor position before ordering. This sensor is a threaded, specific-fit replacement, so the connector shape, wire count, and harness length should be matched to the original part. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation, since physical damage can shorten sensor life and affect signal quality.

For best results, verify the upstream left, upstream right, or upstream location shown for your vehicle and compare the original connector and thread specification to the replacement part.

Quality Assurance

Walker Products manufactures this OE Replacement sensor as a standard replacement part for the listed applications and supports it with ISO 9001/TS 16949-certified production practices.