Denso 234-9158 Air / Fuel Ratio Sensor - Upstream Left or Upstream Right

Reliable Air/Fuel Ratio Sensor for Lexus and Toyota Vehicles

The Denso OE Style 234-9158 Air/Fuel Ratio Sensor is engineered to provide precise emissions control for select Lexus and Toyota models. Designed as a specific fit part, it ensures accurate sensor readings and optimal engine performance.

• Heated sensor type for faster response times
• Specific fitment for Lexus Highlander, RX350, RX350L, RX450h, RX450hL, and Toyota Sienna
• 17.32-inch wiring harness length for proper installation
• Four-wire configuration with male connector
• Thread diameter of 0.709 inches for secure mounting
• Regular grade type for standard durability and performance

About the Denso OE Style Product Line

The OE Style line from Denso focuses on delivering parts that meet original equipment specifications. This Air/Fuel Ratio Sensor 234-9158 is manufactured to match the fit, form, and function of the factory-installed sensor, ensuring compatibility and reliable operation within the vehicle’s emission control system.

Detailed Product Description

This Denso Air/Fuel Ratio Sensor 234-9158 is a heated sensor designed to provide accurate air-to-fuel mixture readings critical for emission control and engine efficiency. The sensor’s 17.32-inch wiring harness length and four-wire design with a male connector allow for a direct replacement without modification. Its specific fitment ensures compatibility with Lexus Highlander, RX350, RX350L, RX450h, RX450hL, and Toyota Sienna models, maintaining proper engine management and emission standards.

Common Issues Addressed by This Sensor

• Incorrect air/fuel mixture readings causing poor fuel economy
• Check engine light triggered by faulty sensor signals
• Increased emissions due to sensor malfunction
• Engine performance issues such as rough idling or hesitation
• Failed emissions tests related to sensor failure

Installation Notes and Tips

Ensure the vehicle is cool before installation to avoid injury. Disconnect the battery to prevent electrical shorts. The 17.32-inch wiring harness length provides flexibility during installation, but verify connector compatibility with the vehicle’s harness. Use proper tools to avoid damaging the 0.709-inch thread diameter sensor during mounting. Follow manufacturer torque specifications for secure installation.

Quality Assurance and Warranty

Denso OE Style sensors are manufactured to meet original equipment standards, ensuring reliable performance and durability. This part undergoes rigorous quality control to comply with emission regulations. Warranty coverage details should be confirmed with the point of purchase or manufacturer documentation.