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

Overview of Walker OE Replacement Oxygen Sensor 350-34988

The Walker OE Replacement Oxygen Sensor 350-34988 is designed to provide accurate air-fuel mixture readings for optimal engine performance. This heated narrow-band sensor is engineered specifically for select Buick, Cadillac, Chevrolet, and GMC models, ensuring precise fit and function.

• Heated oxygen sensor for faster response times
• Specific fit for Buick, Cadillac, Chevrolet, and GMC vehicles
• Narrow-band sensor type with 4-wire configuration
• Threaded mounting with M18 x 1.5 thread size
• Blade terminal type with male connectors and oblong shape
• Wiring harness length of 425 mm and overall length of 433 mm
• Standard replacement grade with 20 gauge wire
• Compatible with wrench size 22 mm for installation

Walker OE Replacement Product Line Details

The OE Replacement line by Walker focuses on delivering direct-fit components that meet original equipment specifications. The 350-34988 oxygen sensor is part of this line, providing reliable emission control sensor performance tailored to specific vehicle applications. This ensures compatibility and durability consistent with factory standards.

Product Features and Specifications

This oxygen sensor features a heated design to reduce warm-up time, improving sensor accuracy shortly after engine start. The narrow-band sensor type is suitable for monitoring exhaust oxygen levels in many GM vehicles, including the Chevrolet Silverado 1500, GMC Sierra 2500 HD, and Cadillac Escalade. The 4-wire configuration includes two wires for the heater circuit and two for the sensor signal, enhancing responsiveness and reliability.

The sensor mounts via a threaded M18 x 1.5 connection and uses a 22 mm wrench size for installation. The blade terminal type with male connectors and an oblong connector shape ensures secure electrical connections. With a wiring harness length of 425 mm and overall length of 433 mm, this sensor fits precisely in the designated engine bay locations.

Compatible Vehicles and Applications

• Buick LaCrosse and Regal Sportback
• Cadillac Escalade and Escalade ESV
• Chevrolet Camaro, Silverado 1500, and Tahoe
• GMC Sierra 1500, Sierra 2500 HD, and Yukon XL
• Express 2500 and 3500, Savana 2500 and 3500

Common Issues Addressed by Oxygen Sensor 350-34988

• Check engine light triggered by faulty oxygen sensor readings
• Poor fuel economy due to incorrect air-fuel mixture
• Rough engine idle or hesitation during acceleration
• Failed emissions tests caused by sensor malfunction
• Increased exhaust emissions and engine performance issues

Installation Notes and Tips

Ensure the engine is cool before removing the old oxygen sensor to avoid burns. Use a 22 mm wrench to carefully remove and install the sensor. Verify the connector type matches the vehicle’s wiring harness for a secure fit. The 4-wire heated sensor requires proper connection of both heater and signal wires. Follow vehicle-specific service manual instructions for torque specifications and sensor location.

Quality Assurance and Warranty

The Walker OE Replacement oxygen sensor 350-34988 is manufactured to meet original equipment standards for fit, form, and function. This standard replacement grade sensor undergoes rigorous testing to ensure reliable performance in emission control systems. Warranty details are provided by Walker and typically cover defects in materials and workmanship under normal use.