Denso 234-4323 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor 234-4323

Denso 234-4323 is an OE Style heated oxygen sensor built for exact replacement and first-time fit. It is engineered for downstream applications on select Nissan Frontier, Xterra, and Sentra models, with the correct threaded mounting and 4-wire configuration for direct service replacement.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific fit design for direct replacement on listed Nissan applications
• 4-wire layout with male connector for OE-style connection
• Threaded mounting with 0.708 in. thread diameter
• 28.94 in. wiring harness length for proper routing
• OE Style construction from Denso, part number 234-4323

OE Style Construction

Denso’s OE Style line is built to match original equipment dimensions and electrical requirements, helping maintain accurate exhaust feedback and stable engine management. The sensor uses a heated design and Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting consistent operation and long service life. This part cross-references Bosch 15973 or NTK 24632 for the same application.

Vehicle Fitment

• Fits 2001-2004 Nissan Frontier, downstream.
• Fits 2001-2004 Nissan Xterra, downstream.
• Fits 1998-2000 Nissan Frontier, downstream; California exempt parts can be used on pollution controlled vehicles in California.
• Fits 2000 Nissan Xterra, downstream; California exempt parts can be used on pollution controlled vehicles in California.
• Fits 1998-1999 Nissan Sentra, downstream.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel feedback from a worn downstream sensor
• Reduced fuel economy caused by inaccurate exhaust readings
• Rougher engine operation tied to aging emissions sensors
• Emissions test failures caused by a faulty downstream sensor

Installation Notes and Tips

Confirm the connector style, wire count, and threaded mounting before installation. Route the 28.94 in. harness away from hot exhaust components and verify the downstream location matches the vehicle application. For Nissan Frontier and Nissan Xterra service, use the listed fitment by year and position to ensure correct placement. Part number 234-4323 is a direct-fit replacement for the applications shown.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for dimensional accuracy, electrical consistency, and reliable fit. The OE Style design is intended to deliver the correct part and the correct fit for the listed Nissan applications.