Denso 234-8004 Oxygen Sensor

Denso OE Style Oxygen Sensor 234-8004

Denso 234-8004 is an OE-style heated oxygen sensor built for direct replacement on select Toyota and Lexus applications. It is engineered for a specific fit, with a 4-wire design, male connector, threaded mounting, and a 16.73-inch wiring harness for the listed downstream locations.

Denso’s OE Style line focuses on exact replacement fitment and factory-level sensor construction. This oxygen sensor uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine management and long service life in the applications listed below.

Key Features

• Heated oxygen sensor for downstream monitoring
• Specific-fit design for direct replacement
• 4-wire configuration with male connector
• Threaded mounting with 0.709-inch thread diameter
• 16.73-inch wiring harness length
• OE Style construction for select Toyota and Lexus vehicles

Detailed Description

This Denso oxygen sensor, part number 234-8004, is designed for downstream positions on select Toyota Corolla, Prius, Highlander, Sienna, Prius Prime, Prius AWD-e, Prius V, and Lexus RX models. It is a direct-fit replacement for vehicles such as the 2020-2024 Toyota Corolla downstream, 2020-2022 Toyota Highlander downstream right, and 2021-2022 Lexus RX350 downstream left applications. The OE-style design helps maintain the original sensor layout and connector style for straightforward replacement.

This part cross-references NTK 24784 for the same application.

What It Helps Address

• Check engine light concerns related to downstream oxygen sensor faults
• Incorrect air-fuel feedback from a worn sensor
• Reduced fuel economy caused by aging sensor response
• Emissions monitoring issues on Toyota and Lexus vehicles
• Fitment problems from non-specific replacement sensors

Installation Notes and Tips

• Verify the vehicle’s downstream sensor position before ordering: downstream, downstream left, downstream right, or downstream front.
• Confirm connector style, wire count, and thread diameter against the original sensor.
• Use the listed fitment for exact year, make, model, and position matches, including Toyota Corolla, Toyota Prius, and Lexus RX applications.
• Inspect the exhaust bung and harness routing before installation to ensure proper seating and clearance.

Quality Assurance

Denso manufactures and tests this OE-style oxygen sensor to strict original-equipment standards for accurate replacement fitment and dependable operation. The sensor’s contamination-resistant trap layer is part of Denso’s design approach for protecting the sensing element and supporting consistent performance in the specified applications.