Denso 234-4087 Oxygen Sensor

Denso OE Style Oxygen Sensor for GM Applications

Denso 234-4087 is an OE Style heated oxygen sensor built for direct replacement in specific GM and Isuzu applications. It is engineered for accurate exhaust feedback, stable engine management, and a first-time fit on vehicles such as the Chevrolet Impala, Buick Regal, Pontiac Grand Prix, and GMC Sonoma.

The OE Style line is designed around factory-style fitment and connector layout, making it a practical choice when replacing a worn downstream or upstream sensor on the listed applications.

Key Features

• Heated oxygen sensor for faster operating readiness
• Specific fit design for direct replacement
• 4-wire configuration with female connector
• Threaded mounting type with 0.708 in. thread diameter
• 12.20 in. wiring harness length for application-specific routing
• Built to OE standards for replacement accuracy
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

Detailed Description

Denso 234-4087 is an OE Style oxygen sensor intended for vehicles that require a direct-fit replacement with factory-style electrical and mounting characteristics. The heated sensor design supports quicker closed-loop operation, while the specific-fit construction helps match the original sensor location and connector requirements. This part cross-references Bosch 13444 and NTK 21528 for the same application.

Compatible With 1996-2004 Buick Century, Downstream; 2000-2004 Chevrolet Impala, Downstream; 1996-2003 Pontiac Grand Prix, Downstream; and 1997-2003 GMC Sonoma, Downstream. It also covers additional applications including Chevrolet Camaro, Pontiac Firebird, Buick LeSabre, Oldsmobile Aurora, and Isuzu Hombre. For buyers searching for a Denso 234-4087 oxygen sensor or an OE style replacement for Chevrolet Impala and Pontiac Grand Prix applications, this part is built to match the listed fitment.

What It Helps Address

• Check engine light concerns related to oxygen sensor performance
• Incorrect air-fuel feedback from a worn sensor
• Reduced fuel economy caused by delayed or inaccurate exhaust readings
• Rough idle or drivability issues tied to sensor response
• Failed emissions testing caused by sensor degradation

Installation Notes and Tips

Verify the sensor position before ordering, since this part is listed for downstream, upstream, upstream right, and downstream right locations depending on the vehicle. Confirm the connector style, wire count, and thread diameter against the original sensor before installation. Use the vehicle-specific routing path for the 12.20 in. harness and inspect the exhaust threads for damage or contamination before threading in the new sensor.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for replacement accuracy and consistent performance. The design includes an aluminum oxide trap layer to help protect the sensing element from silicone and lead contamination, supporting long service life in demanding exhaust environments.