Denso 234-4776 Oxygen Sensor - Downstream Left, Downstream Rear or Downstream Right

Denso OE Style Oxygen Sensor 234-4776

Denso 234-4776 is an OE Style heated oxygen sensor built for specific-fit replacement on select Infiniti and Nissan applications. It is engineered for accurate exhaust feedback, stable engine management, and a first-time fit on the listed downstream positions.

Key Features

• Heated oxygen sensor with specific fitment for direct replacement
• 4-wire design with male connector and threaded mounting
• Wiring harness length: 39.37 in.
• Thread diameter: 0.708 in.
• OE Style construction for factory-style fit and function
• Built with Denso’s aluminum oxide trap layer to help protect the sensing element from silicone and lead contamination

Product Details

Denso OE Style sensors are manufactured and tested to OE standards, with precision-built components that match the original application. Part number 234-4776 is a direct replacement oxygen sensor for downstream locations on select 1998-2001 Infiniti I30, 2001 Infiniti QX4, and 1998-2001 Nissan Maxima, Pathfinder, and Sentra applications. This part cross-references Bosch (e.g., 13374, 15377) for the same application.

For buyers searching for a downstream oxygen sensor for 2001 Nissan Maxima, a downstream right O2 sensor for 2001 Nissan Pathfinder, or a downstream left oxygen sensor for 2001 Nissan Sentra, this OE Style Denso unit is built to match the listed vehicle and position requirements. The Denso 234-4776 is also a fitment-focused choice for 2000-2001 Infiniti I30 and 2001 Infiniti QX4 downstream applications.

What This Sensor Helps Address

• Check engine light caused by a failing downstream oxygen sensor
• Incorrect exhaust oxygen readings affecting fuel control
• Reduced fuel economy from degraded sensor response
• Rough idle or drivability issues tied to inaccurate feedback
• Emissions test failures related to sensor performance

Installation Notes and Tips

Verify the connector style, wire count, thread diameter, and downstream position before installation. This sensor uses a threaded mounting design and a male connector, so it should be matched to the original harness and exhaust bung on the listed Infiniti and Nissan vehicles. Confirm the exact model year and position notes, including California and clean-air vehicle exceptions where shown in the fitment data.

Quality Assurance

Denso manufactures this OE Style oxygen sensor to strict original-equipment standards and tests each unit for replacement accuracy and fit. The design includes a protective aluminum oxide trap layer intended to help shield the ceramic element from contamination, supporting consistent sensor performance and long service life.