Denso 234-4327 Oxygen Sensor - Downstream Left

Denso OE Style Oxygen Sensor for Nissan and Infiniti

This Denso OE Style oxygen sensor is a direct-fit, heated sensor built for specific applications in the exhaust stream. It is engineered for the 2001 Infiniti QX4 downstream left and the 2001 Nissan Pathfinder downstream left, with the exact fit and connector layout needed for a clean replacement.

Part number 234-4327 is designed to match OE-style requirements for accurate signal response and dependable operation. For shoppers searching for a 2001 Nissan Pathfinder downstream left oxygen sensor or a 2001 Infiniti QX4 downstream left oxygen sensor, this Denso unit provides a vehicle-specific solution.

Key Features

• OE Style replacement oxygen sensor from Denso
• Heated sensor design for faster operating temperature
• Specific fit for direct replacement on listed vehicles
• 4-wire configuration with male connector
• Threaded mounting type with 0.708 in. thread diameter
• 47.64 in. wiring harness length for application-specific routing

OE Style Design and Fit

Denso’s OE Style line focuses on exact replacement fitment and factory-style performance. The sensor is precision built to match the original application, helping maintain proper exhaust feedback on the 2001 Infiniti QX4 and 2001 Nissan Pathfinder. Part number 234-4327 is also cross-referenced to Bosch 15445 for the same application.

What This Oxygen Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel feedback from a worn downstream sensor
• Reduced fuel economy caused by aging exhaust sensors
• Slow sensor response after extended service life
• Emissions system faults tied to sensor degradation

Installation Notes and Tips

Verify the downstream left position before ordering and confirm connector style, wire count, and thread size against the original sensor. This part fits 2001 Infiniti QX4, downstream left, and 2001 Nissan Pathfinder, downstream left, to 08/00. Use proper exhaust sensor removal practices to avoid damaging the threads or wiring during replacement.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards, with attention to first-time fit and consistent performance. The design includes an aluminum oxide trap layer that helps protect the ceramic element from silicone and lead contamination, supporting long service life and stable engine management.