Denso 234-4286 Oxygen Sensor - Downstream Left or Downstream Right

Denso OE Style Oxygen Sensor 234-4286

Denso 234-4286 is an OE-style heated oxygen sensor built for direct replacement on specific GM, Pontiac, Saturn, and Cadillac applications. It is engineered for exact fit and reliable signal feedback, helping maintain proper air-fuel control on downstream sensor locations.

Designed for vehicles such as the Chevrolet Silverado 2500 HD, GMC Sierra 2500 HD, Pontiac G6, and Saturn Aura, this Denso oxygen sensor follows OE-style dimensions and connector layout for a straightforward replacement. The 234-4286 part number is a direct-fit option for drivers servicing downstream left or downstream right sensor positions.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for direct replacement applications
• 4-wire configuration with male connector
• Threaded mounting with 0.708 in. thread diameter
• 21.65 in. wiring harness length for OE-style routing
• Built to Denso OE standards for fit and function
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

OE Style Construction

Denso’s OE Style line is focused on replacement parts that match original equipment fitment and performance expectations. This oxygen sensor is precision built for first-time fitment and consistent installation on the listed vehicles. The Denso 234-4286 is a practical choice when replacing a worn downstream sensor on a Chevrolet Silverado 1500 HD or GMC Yukon XL 2500, as well as other listed GM platforms.

This part cross-references Bosch 15468 and NTK 21548 for the same application.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback from a failing downstream sensor
• Reduced fuel economy caused by inaccurate exhaust monitoring
• Slow sensor response after extended heat cycling
• Contamination-related sensor degradation from silicone or lead exposure

Installation Notes

Verify the sensor position before ordering, since this part is listed for downstream left and downstream right applications depending on vehicle. Confirm connector style, thread diameter, and harness length against the original sensor before installation. Use proper oxygen sensor service tools and follow the vehicle manufacturer’s torque specifications for threaded mounting.

Fits 2002-2007 Chevrolet Silverado 2500 HD, downstream left; fits 2007 Chevrolet Silverado 1500 Classic, downstream left; fits 2007 Pontiac G6, downstream right; fits 2007 Saturn Aura, downstream right. Additional coverage includes Chevrolet Silverado 3500, GMC Sierra 2500 HD, GMC Sierra 3500 HD, Cadillac Escalade ESV, and related listed applications.

Quality Assurance

Denso manufactures and tests this oxygen sensor to strict OE standards for replacement accuracy and dependable operation. The OE-style design, specific fit, and contamination-resistant trap layer support consistent performance across the listed applications.