Denso 234-4049 Oxygen Sensor - Upstream

Denso OE Style Oxygen Sensor 234-4049

Denso 234-4049 is an OE Style heated oxygen sensor built for direct replacement on select Chevrolet, Geo, Pontiac, and Suzuki applications. It is engineered for specific fitment, threaded mounting, and a first-time fit on upstream locations where accurate exhaust feedback matters.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for direct replacement service
• 4-wire configuration with male connector
• Threaded mounting with 0.708 in. thread diameter
• 14.96 in. wiring harness length for application-specific routing
• OE Style construction for factory-like fit and function

OE Style Design and Sensor Protection

The Denso OE Style line is built to match original equipment dimensions and electrical requirements for the application. This sensor uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine management, consistent fuel control, and long service life. Part number 234-4049 is a direct replacement choice for upstream oxygen sensor service on vehicles such as the Chevrolet Metro, Suzuki Swift, and Pontiac Firefly.

This part cross-references Bosch 13500 and NTK 21527 for the same application.

Vehicle Fitment

• Fits 1998-2001 Chevrolet Metro, Upstream, OE Style
• Fits 1995-2001 Suzuki Swift, Upstream, OE Style
• Fits 1999-2000 Chevrolet Tracker, Upstream, Excluding California; OE Style
• Fits 1995-2000 Pontiac Firefly, Upstream, OE Style
• Fits 1999-2000 Suzuki Vitara, Upstream, Excluding California; OE Style
• Fits 1995-1997 Geo Metro, Upstream, OE Style
• Fits 1994 Geo Metro, Upstream, California exempt parts can be used on pollution controlled vehicles in California; OE Style
• Fits 1994 Pontiac Firefly, Upstream, California exempt parts can be used on pollution controlled vehicles in California; OE Style
• Fits 1994 Suzuki Swift, Upstream, California exempt parts can be used on pollution controlled vehicles in California; OE Style

Common Replacement Uses

• Restores accurate exhaust oxygen feedback for fuel control
• Addresses check engine light concerns related to upstream sensor performance
• Helps correct poor fuel economy caused by a worn sensor
• Supports smoother engine operation when the original sensor response slows
• Replaces a damaged or contaminated oxygen sensor on compatible Chevrolet Metro and Suzuki Swift applications

Installation Notes

Verify the connector style, wire count, threaded mounting, and upstream location before installation. Match the vehicle year, make, model, and emissions notes exactly, especially for California-specific and excluding-California applications. Use the existing harness routing and sensor location as a reference to confirm the 14.96 in. lead length is appropriate for the vehicle.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for direct replacement service. The OE Style design is intended to deliver the correct part and fit for the listed applications, with precision-built construction for consistent installation and operation.