Denso 234-8003 Oxygen Sensor

Denso OE Style Oxygen Sensor for Lexus and Toyota

Denso 234-8003 is an OE Style heated oxygen sensor built for exact replacement on select Lexus RX and Toyota Highlander applications. It is engineered for specific fitment, stable signal performance, and direct installation on the listed downstream and upstream positions.

Key Features

• Heated oxygen sensor with a specific-fit design
• OE Style replacement for select Lexus RX350, RX350L, RX450h, and RX450hL applications
• 4-wire configuration with female connector
• Threaded mounting design with 0.709 in. thread diameter
• Wiring harness length: 25.39 in.
• Denso aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination
• Built and tested to OE standards for consistent replacement fit and function

Product Details

Denso 234-8003 is part of Denso’s OE Style line, which focuses on direct-replacement sensors built to match factory specifications. This oxygen sensor is designed for precise fitment on the listed Lexus RX and Toyota Highlander vehicles, including downstream right, downstream left, downstream rear, and upstream right positions where specified. For shoppers searching for a Lexus RX350 oxygen sensor or Toyota Highlander downstream oxygen sensor, this OE-style replacement provides the correct connector, thread size, and harness length for the application.

This part cross-references NTK 24794 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings
• Reduced fuel economy caused by a failing sensor
• Slow or inaccurate exhaust oxygen feedback to the engine control system
• Sensor contamination from silicone or lead exposure

Installation Notes and Tips

• Verify the exact position before ordering: downstream right, downstream left, downstream rear, or upstream right, depending on the vehicle.
• Confirm connector style, wire count, and thread diameter against the original sensor before installation.
• Use proper oxygen sensor service tools to avoid damaging the threaded bung or sensor body.
• Inspect the harness routing and connector condition during replacement.
• Clear diagnostic trouble codes and confirm sensor operation after installation.

Quality Assurance

Denso manufactures and tests this OE Style oxygen sensor to strict original-equipment standards for fit, function, and durability. The sensor’s protective trap layer is designed to improve resistance to contamination and support long service life in the listed Lexus RX and Toyota Highlander applications.