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

Denso OE Style Air/Fuel Ratio Sensor

The Denso 234-9158 is an OE Style heated air/fuel ratio sensor built for precise replacement and a first-time fit. It is a specific-fit sensor with a 4-wire design, male connector, and 17.32-inch wiring harness length for direct replacement in supported Lexus and Toyota applications.

Denso manufactures and tests this sensor to OE-level standards, with exact replacement dimensions and thread specifications for a proper fit in the exhaust stream. If you are replacing a failing upstream sensor on a Lexus RX350, RX450h, or Toyota Sienna/Highlander, this part number 234-9158 is built for the application.

Key Features

• OE Style air/fuel ratio sensor for direct replacement
• Heated sensor design for faster operating temperature
• Specific fit for supported Lexus and Toyota vehicles
• 4-wire configuration with male connector
• 17.32-inch wiring harness length
• Thread diameter: 0.709
• Cross-reference: NTK 24662 and Toyota 894670E240 for the same application

Detailed Description

Denso 234-9158 is an emission control sensor used to monitor exhaust oxygen content and help the engine control module maintain the correct air-fuel mixture. This OE Style replacement is built for upstream positions and matches the original fit and connection style used on select Lexus RX350, RX350L, RX450h, RX450hL, and Toyota Sienna and Highlander models. The part number 234-9158 is a practical choice when you need a direct-fit replacement that follows the original sensor layout.

Compatible With 2020-2022 Lexus RX350, Upstream Right; 2020-2022 Lexus RX350L, Upstream Left; 2019-2022 Lexus RX450h, Upstream Right; 2020-2022 Lexus RX450hL, Upstream Left; 2020 Toyota Sienna, Upstream Left; 2016 Toyota Sienna, Upstream Left; 2019 Lexus RX350, Upstream Right; 2016-2017 Lexus RX350, Upstream Right; 2019 Lexus RX350L, Upstream Left; 2018-2019 Lexus RX450hL, Upstream Left; 2017-2019 Toyota Highlander, Upstream Left; 2017-2019 Toyota Sienna, Upstream Right; 2018 Lexus RX350, Upstream Right; 2018 Lexus RX350L, Upstream Left; 2016-2018 Lexus RX450h, Upstream Right; 2017-2018 Toyota Highlander, Upstream Right.

What It Helps Address

• Check engine light related to air/fuel ratio sensor performance
• Rough idle caused by incorrect fuel mixture feedback
• Reduced fuel economy from inaccurate exhaust sensing
• Driveability issues tied to upstream sensor signal faults
• Emission test failures linked to sensor response problems

Installation Notes and Tips

Install this sensor in the upstream position specified for the vehicle application and verify connector style, wire length, and thread diameter before installation. Because this is a specific-fit sensor, matching the exact year, make, model, and bank/side position is important for proper operation. For Lexus RX350 and Toyota Sienna/Highlander applications, confirm the upstream left or upstream right location before ordering.

Quality Assurance

Denso builds this OE Style sensor to strict original-equipment standards and tests each component for accurate replacement fit and function. The design focuses on correct dimensions, reliable connector compatibility, and consistent sensor performance for supported Lexus and Toyota applications.