Denso 234-2001 Oxygen Sensor - Upstream

Denso 234-2001 Oxygen Sensor for OE-Style Replacement

Denso 234-2001 is an OE Style oxygen sensor built for specific-fit replacement on a wide range of GM and Cadillac applications. It is a non-heated, threaded upstream sensor with a male connector and 14.80-inch wiring harness length for direct service on vehicles such as Cadillac DeVille, Eldorado, Seville, and Pontiac Firebird.

Key Features

• OE Style design for exact replacement fit and function
• Specific fit oxygen sensor for upstream locations
• Non-heated sensor with 2-wire configuration
• Male connector and threaded mounting type
• 14.80-inch wiring harness length
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination
• Built and tested to OE standards for consistent sensor performance

Product Details

Denso 234-2001 is engineered for drivers and technicians who need a direct replacement oxygen sensor for older Cadillac, Buick, Chevrolet, Oldsmobile, Pontiac, and related GM platforms. This upstream oxygen sensor is designed to deliver the correct fit the first time, with OE-style construction that matches the original application requirements. It cross-references Bosch 12028 and NTK 21553 for the same application.

Compatible With 1979-1995 Cadillac DeVille, Upstream; 1980-1993 Cadillac Eldorado, Upstream; 1980-1993 Cadillac Seville, Upstream; 1979-1981 Pontiac Firebird, Upstream; and other listed GM applications. The Denso 234-2001 part number is also a useful reference when sourcing an OE-style oxygen sensor for emissions service on these vehicles.

Common Issues This Sensor Can Help Address

• Check engine light related to oxygen sensor performance
• Rough idle or inconsistent air-fuel mixture readings
• Reduced fuel economy caused by inaccurate exhaust feedback
• Failed emissions inspection tied to a worn upstream sensor
• Delayed sensor response from age, contamination, or heat cycling

Installation Notes and Tips

Verify the connector style, thread diameter, and upstream location before installation. This is a specific-fit, non-heated sensor, so confirm the vehicle uses a 2-wire configuration and threaded mounting. Inspect the harness routing and exhaust threads during service, and compare the original sensor to Denso 234-2001 before final installation.

Quality Assurance

Denso manufactures this OE Style oxygen sensor to strict original-equipment standards and tests each component for replacement accuracy and first-time fit. The aluminum oxide trap layer is used to help protect the sensing element from silicone and lead contamination, supporting long-term sensor durability and stable engine management performance.