Denso 234-8026 Oxygen Sensor - Downstream or Downstream Left

Denso OE Style Oxygen Sensor 234-8026

Denso 234-8026 is an OE Style heated oxygen sensor built for direct replacement on select Nissan and INFINITI applications. It is engineered for a specific fit, threaded mounting, and accurate signal control to support proper air-fuel management in downstream locations.

Key Features

• OE Style replacement oxygen sensor for downstream applications
• Heated sensor design for faster operating response
• Specific fit for direct replacement installation
• 4-wire configuration with male connector
• Threaded mounting with 0.701 in. thread diameter
• 11.18 in. wiring harness length
• Built to OE standards for exact replacement fit and function
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

Detailed Description

This Denso oxygen sensor is designed for vehicles that require a downstream replacement sensor with OE-style dimensions and connector layout. The part number 234-8026 is used in select Nissan Altima, Armada, Sentra, TITAN, and TITAN XD models, as well as INFINITI Q50, Q60, QX60, and QX80 applications. It is also a direct-fit option for the 2020 Nissan Pathfinder downstream left position.

Denso’s OE Style line focuses on precision-built replacement sensors that match the original installation point and electrical configuration. The heated design helps the sensor reach operating temperature efficiently, while the protective trap layer is intended to reduce contamination-related wear on the sensing element. This part cross-references NTK 24160 for the same application.

Vehicle Fitment

• Fits 2020-2024 INFINITI Q50, Downstream
• Fits 2021-2024 INFINITI QX80, Downstream
• Fits 2019-2024 Nissan Altima, Downstream
• Fits 2020-2024 Nissan Armada, Downstream
• Fits 2020-2024 Nissan Sentra, Downstream
• Fits 2020-2024 Nissan TITAN, Downstream
• Fits 2020-2024 Nissan TITAN XD, Downstream
• Fits 2020-2022 INFINITI Q60, Downstream
• Fits 2020 INFINITI QX60, Downstream
• Fits 2020 Nissan Pathfinder, Downstream Left
• Fits 2016-2019 INFINITI Q50, Downstream
• Fits 2017-2019 INFINITI Q60, Downstream

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel feedback from a worn sensor
• Slow sensor response after extended service life
• Contamination-related sensor degradation from silicone or lead exposure
• Fitment issues caused by non-specific replacement sensors

Installation Notes

Verify the downstream position before ordering, since this part is listed for downstream and downstream left applications only. Confirm connector style, wire count, thread diameter, and harness length against the original sensor before installation. For best results, inspect the exhaust threads and wiring routing during replacement on Nissan Altima, Armada, Sentra, TITAN, TITAN XD, and INFINITI Q50 applications.

Quality Assurance

Denso manufactures and tests this OE Style oxygen sensor to strict original-equipment standards for replacement accuracy and consistent performance. The design is intended to provide the correct part and fit for the listed applications, with OE-style construction focused on long service life and dependable sensor operation.