Denso 234-4025 Oxygen Sensor - Downstream, Downstream Left, Upstream or Upstream Left

Denso OE Style Oxygen Sensor 234-4025

Denso 234-4025 is an OE Style heated oxygen sensor built for direct replacement on select Cadillac, Chevrolet, and Pontiac applications. It is engineered for a specific fit and uses a 4-wire, threaded design with a female connector for straightforward service on the correct upstream or downstream location.

Key Features

• OE Style replacement oxygen sensor for precise fitment
• Heated sensor design for faster operating response
• Specific fit application with threaded mounting
• 4-wire configuration with female connector
• Wiring harness length: 16.54
• Thread diameter: 0.708
• Built to OE standards for replacement accuracy
• Includes Denso aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination

Detailed Description

This Denso oxygen sensor is designed for vehicles that rely on accurate exhaust feedback for fuel control and emissions monitoring. The OE Style construction supports a first-time fit on the listed Cadillac DeVille, Cadillac Eldorado, Cadillac Seville, Chevrolet Camaro, and Pontiac Firebird applications, including upstream left and downstream positions where specified. Denso 234-4025 is manufactured and tested to OE-level standards, with a heated sensing element and contamination-resistant trap layer that help maintain consistent signal quality and long service life.

This part cross-references Bosch 13444 and NTK 21544 for the same application.

Vehicle Fitment

• Fits 1998-2002 Chevrolet Camaro, Upstream Left
• Fits 2000-2002 Chevrolet Camaro, Downstream
• Fits 1998-1999 Chevrolet Camaro, Downstream Left
• Fits 1998-2002 Pontiac Firebird, Upstream Left
• Fits 2000-2002 Pontiac Firebird, Downstream
• Fits 1998-1999 Pontiac Firebird, Downstream Left
• Fits 1996-2000 Cadillac Eldorado, Downstream
• Fits 1996-1998 Cadillac Eldorado, Upstream, Loc. Exhaust Pipe
• Fits 1996-2000 Cadillac Seville, Downstream
• Fits 1996-1998 Cadillac Seville, Upstream, Loc. Exhaust Pipe
• Fits 1996-1999 Cadillac DeVille, Downstream
• Fits 1996-1998 Cadillac DeVille, Upstream, Loc. Exhaust Pipe

Common Replacement Reasons

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings
• Reduced fuel economy from a failing sensor signal
• Slow sensor response during closed-loop operation
• Emissions test failure tied to exhaust feedback faults

Installation Notes and Tips

Confirm the sensor position before ordering, since this part is listed for specific upstream left, downstream, and downstream left locations. Match the 4-wire female connector, threaded mounting style, and harness length to the original sensor before installation. For best results, inspect the exhaust threads and wiring routing during replacement on Camaro, Firebird, DeVille, Eldorado, and Seville applications.

Quality Assurance

Denso manufactures this OE Style oxygen sensor to strict original-equipment standards and tests each component for replacement accuracy and fit. The design includes contamination protection for the sensing element, supporting dependable operation in the listed applications.