Denso 234-4344 Oxygen Sensor - Upstream Left

Denso 234-4344 Oxygen Sensor for OE-Style Replacement

Denso 234-4344 is an OE Style heated oxygen sensor built for direct replacement in select Chevrolet Astro and GMC Safari applications. It is engineered for a specific fit and uses a 4-wire, female connector design with a threaded mounting style for accurate installation.

Denso’s OE Style line focuses on exact replacement fitment and sensor construction that matches original equipment expectations. This oxygen sensor uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine operation and consistent fuel control.

Key Features

• OE Style oxygen sensor for direct replacement fitment
• Heated sensor design for faster operating response
• Specific fit application for select GM vehicles
• 4-wire configuration with female connector
• Threaded mounting type with 0.708 in. thread diameter
• Wiring harness length: 12.13 in.
• Cross-references Bosch 15894 and NTK 21545 for the same application

Detailed Description

The Denso 234-4344 oxygen sensor is designed for 2003-2005 Chevrolet Astro, upstream left, and 2003-2005 GMC Safari, upstream left. This part number is built to OE standards for a first-time fit and consistent sensor performance in emissions control systems. If you are replacing a worn upstream oxygen sensor on a Chevrolet Astro or GMC Safari, this OE Style Denso sensor provides the correct configuration for the listed applications.

As part of Denso’s OE Style product line, this sensor is precision built to match original equipment dimensions and electrical layout. The heated design helps the sensor reach operating temperature efficiently, while the protective trap layer helps reduce contamination-related wear over time. The Denso 234-4344 is a direct-fit oxygen sensor for drivers and technicians who need the correct part number and fitment for these GM vans.

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Incorrect air-fuel mixture readings
• Reduced fuel economy caused by a failing sensor
• Rough idle or drivability issues tied to sensor signal loss
• Emissions test failures from a worn oxygen sensor

Installation Notes and Tips

Verify the upstream left position before ordering, since this part is specific to the listed applications. Confirm connector style, wire count, and thread size against the original sensor before installation. For best results, inspect the harness routing and exhaust threads during replacement to ensure proper seating and electrical connection.

Quality Assurance

Denso manufactures and tests this oxygen sensor to strict OE standards for replacement accuracy and consistent performance. The OE Style line is built for exact fitment on the listed Chevrolet Astro and GMC Safari applications, with design features intended to support long-term sensor durability.