Denso 234-4312 Oxygen Sensor - Downstream Front, Downstream Rear or Downstream Right

Denso OE Style Oxygen Sensor 234-4312

Denso Oxygen Sensor 234-4312 is an OE Style, specific-fit heated oxygen sensor built for direct replacement on select Nissan and INFINITI applications. It is engineered for accurate exhaust monitoring, stable signal output, and a first-time fit on downstream right, downstream rear, and downstream front positions where listed.

Key Features

• Heated oxygen sensor for faster operating readiness
• Specific fit design for direct replacement
• 4-wire configuration with male connector
• Threaded mounting type with 0.708 in. thread diameter
• 15.35 in. wiring harness length for application-specific routing
• OE Style construction for factory-style fit and function

OE Style Line Details

Denso’s OE Style line focuses on exact replacement parts built to match original equipment requirements. For this oxygen sensor, that means application-specific fitment, consistent connector design, and sensor construction intended to support accurate exhaust feedback on vehicles such as the Nissan 350Z, Nissan Altima, Nissan Maxima, Nissan Quest, and INFINITI G35.

This part cross-references Bosch (e.g., 15521, 15522) for the same application.

Detailed Description

Denso 234-4312 is a heated oxygen sensor for select Nissan and INFINITI models, including downstream right, downstream rear, and downstream front locations where specified. It is manufactured and tested to OE standards, with precision-built components for direct replacement and proper fit. The sensor uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting reliable engine management performance and long service life. Fits 2003-2007 INFINITI G35, downstream right; Fits 2005-2006 Nissan Altima, downstream rear; Fits 2003-2006 Nissan 350Z, downstream right; Fits 2004-2006 Nissan Maxima, downstream right; Fits 2007-2009 Nissan Quest, downstream right.

What This Sensor Helps Address

• Check engine light caused by oxygen sensor failure
• Incorrect air-fuel ratio feedback from a worn sensor
• Reduced fuel economy from slow or inaccurate exhaust readings
• Rough idle or drivability issues related to sensor degradation
• Emissions test failures tied to faulty downstream sensor performance

Installation Notes and Tips

Verify the connector style, wire count, thread diameter, and sensor position before installation. This is a specific-fit sensor, so confirm the exact downstream right, downstream rear, or downstream front location listed for your vehicle. Inspect the harness routing and exhaust threads before installation to ensure the sensor seats correctly and the wiring reaches without strain.

Quality Assurance

Denso manufactures and tests this oxygen sensor to strict OE standards for replacement accuracy and consistent performance. The OE Style design is intended to deliver the right part and the right fit for the listed Nissan and INFINITI applications, including Denso 234-4312.