Denso 234-4283 Oxygen Sensor - Upstream

Denso 234-4283 Oxygen Sensor for Pontiac G8

Denso 234-4283 is an OE-style heated oxygen sensor built for precise replacement and a first-time fit. It is engineered for the upstream position on the 2008-2009 Pontiac G8 and uses a threaded, specific-fit design for direct installation.

Key Features

• Heated oxygen sensor for upstream exhaust monitoring
• Specific fit for the 2008-2009 Pontiac G8
• 4-wire design with male connector
• Threaded mounting type with 0.708 in. thread diameter
• Wiring harness length: 11.77 in.
• OE-style replacement from Denso, part number 234-4283

OE-Style Sensor Construction

Denso’s OE Style line is built to match original equipment requirements for fit and function. This oxygen sensor uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine management, fuel efficiency, and long service life. If you are replacing a worn upstream sensor on a Pontiac G8, Denso 234-4283 provides a direct-fit solution with the correct connector and threaded mounting style.

This part cross-references Bosch 16379 for the same application.

Common Problems This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Rough idle caused by inaccurate air-fuel feedback
• Reduced fuel economy from a slow or aging upstream sensor
• Emissions test failures tied to sensor response issues
• Delayed engine management corrections during closed-loop operation

Installation Notes and Tips

Confirm the upstream sensor location before installation and verify connector style, wire count, and thread size against the original part. Because this is a specific-fit sensor for the Pontiac G8, compare the old sensor’s harness length and connector orientation before removal. Use proper exhaust sensor service procedures to avoid damaging the threads or wiring.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for exact replacement fit and consistent performance. Part number 234-4283 is engineered for the 2008-2009 Pontiac G8 upstream application and is built to meet the demands of modern engine control systems.