Denso 234-5045 Air / Fuel Ratio Sensor - Upstream, Upstream Left or Upstream Right

Denso OE Style Air/Fuel Ratio Sensor

Denso 234-5045 is an OE Style heated air/fuel ratio sensor built for specific-fit replacement in select Audi, Volkswagen, and Porsche applications. It is engineered to match factory-style dimensions and connector layout for a direct service replacement on upstream positions.

The Denso OE Style line focuses on exact replacement fitment and consistent sensor construction, making it a practical choice for drivers servicing emissions-related drivability concerns on vehicles such as the Audi Q7, Volkswagen Touareg, and Porsche Cayenne.

Key Features

• Heated air/fuel ratio sensor for upstream emission control service
• Specific-fit design for direct replacement applications
• 5-wire configuration with male connector
• Wiring harness length: 67.72
• Thread diameter: 0.711
• OE Style product line for factory-matched replacement fitment

Detailed Description

Denso part number 234-5045 is a heated air/fuel ratio sensor designed to replace the original sensor in specific upstream locations. Built to OE standards, it is precision-made for accurate fitment and dependable installation on vehicles that require a factory-style sensor configuration. This part cross-references Bosch 17157 and NTK 24310 for the same application.

Compatible With 2007-2010 Audi Q7, upstream; 2007-2009 Volkswagen Touareg, upstream; 2003-2006 Porsche Cayenne, upstream right; and additional Audi, Volkswagen, and Porsche applications listed in the fitment data. The Denso 234-5045 is also listed for select Volkswagen Golf, Jetta, Beetle, Passat, R32, and Audi TT Quattro applications where the original sensor location and connector style match.

What It Helps Address

• Check engine light concerns related to air/fuel ratio sensor performance
• Rough idle or inconsistent fuel trim readings caused by a failing upstream sensor
• Emissions test failures tied to sensor response issues
• Slow sensor switching or inaccurate exhaust mixture feedback
• Factory-fit replacement needs after sensor aging or contamination

Installation Notes and Tips

Verify the exact year, engine configuration, and sensor position before ordering. This part is specific fit, so confirm the upstream location, connector style, wire count, and thread diameter against the original sensor. On applications such as Audi A8 Quattro, Volkswagen Jetta, and Porsche Cayenne, fitment notes may reference chassis or engine-specific conditions that should be checked carefully before installation.

Use proper oxygen sensor service tools and follow the vehicle manufacturer’s removal and torque procedures. Inspect the harness routing and connector condition during replacement to help ensure a clean installation and correct sensor operation.

Quality Assurance

Denso manufactures and tests this OE Style sensor to OE-level standards for replacement accuracy and first-time fit. The 234-5045 is built as a direct-fit service part for specific applications, with the goal of matching original equipment dimensions and electrical configuration.