Denso 234-4311 Oxygen Sensor - Downstream Left

Denso OE Style Oxygen Sensor for Pathfinder

This Denso OE Style oxygen sensor is a specific-fit replacement for the downstream left position on the 2003 Nissan Pathfinder. Built to match OE standards, it is engineered for accurate exhaust feedback, stable engine management, and a first-time fit.

Part number 234-4311 is a heated, threaded oxygen sensor with a 4-wire male connector and a 48.03-inch wiring harness. For 2003 Nissan Pathfinder downstream left applications, 234-4311 provides the OE-style configuration needed for direct replacement service.

Key Features

• OE Style replacement for direct-fit service
• Heated oxygen sensor design for faster operating response
• Specific fit for the downstream left position on the 2003 Nissan Pathfinder
• 4-wire construction with male connector
• Threaded mounting type with 0.708-inch thread diameter
• 48.03-inch wiring harness length for proper routing
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

Product Details

Denso designs this oxygen sensor to meet strict OE standards for replacement accuracy and consistent performance. The sensor’s heated design supports quicker readiness after startup, while the OE-style construction helps maintain proper exhaust monitoring for the engine control system. This part number 234-4311 is a direct replacement choice for 2003 Nissan Pathfinder downstream left service, and it cross-references ACDelco 213-2953 and Bosch 15527 for the same application.

Denso’s OE Style line focuses on exact replacement fitment and dependable sensor response. For Nissan Pathfinder owners addressing drivability or emissions-related service, this sensor is built to restore the factory-style signal path and mounting configuration without modification.

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
• Emissions test failure tied to sensor response issues
• Rough or inconsistent engine operation from degraded sensor output

Installation Notes and Tips

Verify the downstream left location before installation on the 2003 Nissan Pathfinder. Match the threaded mounting style, 4-wire connector, and harness length to the original sensor before routing the lead. Inspect the exhaust bung threads and connector condition during replacement to help ensure proper seating and electrical connection.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for replacement accuracy and dependable operation. The OE Style line is built for exact fitment and includes an aluminum oxide trap layer to help protect the sensing element from contamination that can shorten sensor life.