Denso 234-4701 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor 234-4701

Denso 234-4701 is an OE Style heated oxygen sensor built for exact replacement on specific Nissan and Mercury applications. It is engineered for the downstream position on 1999-2002 Nissan Quest and Mercury Villager models, with a first-time fit that supports accurate exhaust feedback and stable engine management.

Key Features

• OE Style replacement oxygen sensor for specific-fit applications
• Heated sensor design for faster operating response
• 4-wire configuration with male connector
• Threaded mounting type with 0.708 in. thread diameter
• 25.59 in. wiring harness length for application-specific routing
• Built to OE standards for dimensional and electrical consistency

Product Details

Denso’s OE Style line focuses on direct-fit replacement parts that match original equipment requirements. This oxygen sensor uses precision-built components for proper installation and dependable signal delivery, and it incorporates an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination. For drivers servicing a 1999-2002 Nissan Quest downstream oxygen sensor or a 1999-2002 Mercury Villager downstream oxygen sensor, part number 234-4701 provides the correct fit and configuration for the listed applications.

This part cross-references Bosch 15769 and NTK 22516 for the same application.

Common Issues This Part May Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel feedback from a worn downstream sensor
• Reduced fuel economy caused by slow or inaccurate exhaust readings
• Failed emissions testing tied to sensor response problems
• Rougher engine operation from degraded exhaust monitoring

Installation Notes and Tips

Verify the downstream location before installation and confirm the connector style, wire count, and threaded mounting dimensions match the original sensor. On Nissan Quest and Mercury Villager applications, route the 25.59 in. harness away from hot exhaust components and inspect the connector and wiring for heat damage before final connection. Always compare the old sensor to Denso 234-4701 before installation to confirm OE-style fitment.

Quality Assurance

Denso manufactures and tests this OE Style oxygen sensor to strict original-equipment standards for fit, function, and durability. The design is intended to deliver accurate replacement performance on the specified Mercury Villager and Nissan Quest applications while maintaining the dimensional consistency expected from an OE-style part.