Walker 350-84004 Oxygen Sensor Set

OE Replacement Oxygen Sensor Set

Walker OE Replacement Part Number 350-84004 is a specific-fit oxygen sensor set for select Chevrolet, GMC, and Cadillac applications. It is built as a standard replacement solution with heated, narrow-band sensors and threaded mounting for direct service on supported vehicles.

Designed for gas and diesel engine applications, this Walker oxygen sensor kit helps restore accurate exhaust feedback for vehicles such as the Chevrolet Express 1500, GMC Savana 2500, and Cadillac Escalade. The part number 350-84004 is intended for complete oxygen sensor service on covered applications, including upstream and downstream sensor locations listed in the fitment data.

Key Features

• Walker OE Replacement line for standard replacement service
• Heated narrow-band oxygen sensor design
• Specific fit for listed vehicle applications
• Threaded mounting with M18 x 1.5 thread size
• 22 mm wrench size
• Engineered for gas and diesel engine use
• Supports oxygen sensor replacement on supported Chevrolet, GMC, and Cadillac models

Product Details

Walker Products oxygen sensor kits are engineered and tested to meet or exceed original equipment specifications. This OE Replacement line focuses on restoring proper fuel-to-air ratio control, engine response, and emissions system performance. For vehicles that rely on narrow-band heated sensors, accurate exhaust monitoring is essential for maintaining efficient operation and emissions compliance. Part number 350-84004 is a direct-fit service part for the listed applications and is suited to routine maintenance on high-mileage vehicles.

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

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust readings
• Rough engine operation tied to incorrect air-fuel feedback
• Increased emissions from worn or slow-responding sensors
• Maintenance replacement on supported Chevrolet Express, GMC Savana, and Cadillac Escalade applications

Installation Notes

Verify the vehicle year, make, model, and sensor location before installation. This oxygen sensor set uses threaded mounting with an M18 x 1.5 thread size and a 22 mm wrench size. Confirm the vehicle uses a narrow-band heated sensor configuration and match the application to the fitment list for proper service.

Compatible With 1996-2002 Chevrolet Express 1500, N/A; 1996-1997 Chevrolet Express 2500, N/A; 1999-2002 Chevrolet Express 2500, N/A; 1996-2002 GMC Savana 1500, N/A; 1996-2002 GMC Savana 2500, N/A; 1999-2001 Chevrolet Silverado 1500, N/A; 1999-2001 GMC Sierra 1500, N/A; 1999-2000 Cadillac Escalade, N/A; 1999 Chevrolet Silverado 2500, N/A; 1999 GMC Sierra 2500, N/A; 1999 GMC Yukon, N/A; 1996-1998 Chevrolet C1500, N/A; 1996-1998 GMC C1500, N/A.

Quality Assurance

Walker Products states that these oxygen sensor kits are designed and tested to meet or exceed original equipment specifications. The OE Replacement line is built for dependable service across domestic and import vehicle coverage, with durability intended for demanding operating conditions.