Denso 234-8008 Oxygen Sensor - Downstream Left

Denso OE Style Oxygen Sensor 234-8008

The Denso 234-8008 is an OE-style heated oxygen sensor built for precise replacement on select Lexus applications. It is engineered for the downstream left position and uses a specific-fit design to match the original sensor layout on covered vehicles.

Denso’s OE Style line focuses on direct-fit replacement parts that follow original equipment standards for fit and function. This oxygen sensor is built with a 4-wire configuration, a threaded mounting type, a male connector, and a 42.52-inch wiring harness length for the specified application.

Key Features

• Heated oxygen sensor for downstream left placement
• Specific-fit design for direct replacement on listed Lexus models
• 4-wire configuration with male connector
• Threaded mounting type with 0.709-inch thread diameter
• 42.52-inch wiring harness length
• OE Style construction for accurate fit and sensor response

Detailed Description

This Denso oxygen sensor is designed for Lexus IS300, IS350, RC300, RC350, and GS350 applications listed below. It is a direct replacement for the downstream left sensor position and is intended to restore proper exhaust feedback for engine management systems. The part number 234-8008 is also referenced in OE-style replacement catalogs for the same application.

Denso builds this sensor to original-equipment standards and uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination. That protection supports stable sensor operation, consistent fuel-control feedback, and long service life in demanding exhaust environments. This part cross-references Toyota 8946530B10 for the same application.

Vehicle Fitment

• Fits 2018-2024 Lexus IS300, downstream left.
• Fits 2018-2024 Lexus IS350, downstream left.
• Fits 2020-2024 Lexus RC300, downstream left.
• Fits 2020-2024 Lexus RC350, downstream left.
• Fits 2020 Lexus GS350, downstream left.
• Fits 2016-2019 Lexus GS350, downstream left.
• Fits 2019 Lexus RC300, downstream left.
• Fits 2019 Lexus RC350, downstream left.
• Fits 2018 Lexus RC300, downstream left, from 10/2017.
• Fits 2018 Lexus RC350, downstream left, from 11/2017.

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
• Slow or unstable sensor response after extended heat exposure
• Fitment problems when replacing a damaged OE-style sensor

Installation Notes and Tips

Confirm the downstream left position before ordering and match the connector, thread size, and harness length to the original sensor. Because this is a specific-fit part, it should be installed on the listed Lexus applications only. Inspect the exhaust bung and wiring routing before installation to ensure the sensor seats correctly and the harness follows the factory path.

Quality Assurance

Denso manufactures and tests this OE Style oxygen sensor to strict original-equipment standards for fit and performance. The design is focused on first-time fitment and dependable operation in the intended Lexus applications.