Denso 234-4108 Oxygen Sensor - Downstream

Denso 234-4108 Oxygen Sensor for OE-Style Replacement

Denso 234-4108 is an OE Style heated oxygen sensor built for specific-fit replacement on select Chevrolet Cavalier, Pontiac Grand Am, and Pontiac Sunfire applications. It is engineered for downstream use and built to match factory fitment and signal requirements for direct service replacement.

Key Features

• OE Style oxygen sensor for direct replacement service
• Heated sensor design for faster operating response
• Specific fit for select downstream applications
• 4-wire configuration with female connector
• Threaded mounting with 0.708 in. thread diameter
• 48.82 in. wiring harness length for vehicle-specific routing
• Built to OE standards with Denso’s aluminum oxide trap layer for added protection against silicone and lead contamination

Detailed Description

This Denso oxygen sensor is designed for downstream exhaust monitoring on 2002-2005 Chevrolet Cavalier, 2005 Pontiac Grand Am, and 2002-2005 Pontiac Sunfire models. The Denso 234-4108 uses a heated, 4-wire design to support accurate exhaust feedback after the catalytic converter, helping maintain proper engine management and emissions system operation. As an OE Style replacement, it is built for exact fitment and straightforward installation in the original sensor location.

Denso’s OE-focused construction emphasizes consistent sensor response and long service life. The protective aluminum oxide trap layer helps shield the ceramic element from contamination, which is important in emissions control service where sensor accuracy affects drivability and fuel control. This part cross-references Bosch 15549 and NTK 21042 for the same application.

What This Oxygen Sensor Helps Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect exhaust oxygen readings affecting fuel control
• Reduced fuel economy caused by a failing sensor
• Emissions test failures tied to sensor performance
• Slow or inaccurate sensor response after catalytic converter service

Installation Notes and Tips

Verify the downstream sensor location before ordering and confirm connector style, thread size, and harness length against the original part. For best results, inspect the exhaust threads and wiring route before installation, and ensure the sensor is tightened to the manufacturer’s service specification. This part fits 2002-2005 Chevrolet Cavalier, downstream; 2005 Pontiac Grand Am, downstream; and 2002-2005 Pontiac Sunfire, downstream.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for fit, function, and durability. The OE Style design supports first-time fitment on the listed applications, and the sensor construction is intended to deliver consistent performance in emissions control service.