Denso 234-5118 Air / Fuel Ratio Sensor - Upstream or Upstream Left

Denso OE Style Air/Fuel Ratio Sensor 234-5118

Denso 234-5118 is an OE Style heated air/fuel ratio sensor built for exact replacement and first-time fit. It is made to the strict OE standard expected for Volkswagen and Audi applications, with the correct connector, wiring length, and sensor configuration for direct replacement service.

Key Features

• Heated air/fuel ratio sensor for precise exhaust feedback
• Specific fit design for direct replacement on listed applications
• 5-wire construction with male connector
• 28.15 in. wiring harness length for proper routing
• 0.711 thread diameter for OE-style installation
• OE Style line focused on exact replacement fit and function

Product Details

This Denso air/fuel ratio sensor, part number 234-5118, is engineered for upstream monitoring on select Volkswagen and Audi vehicles. It is listed for 2009-2017 Volkswagen CC, Upstream Left; 2006-2010 Volkswagen Passat, Upstream Left; 2009-2010 Volkswagen Passat CC, Upstream Left; and 2007 Audi S6, Upstream. The OE Style design supports a direct-fit replacement approach for drivers servicing emissions and fuel-control systems on these platforms.

The Denso OE Style line is built around exact replacement requirements, with components precision-built to match the original application. That makes this sensor a practical choice when replacing a worn or failing upstream air/fuel ratio sensor on Volkswagen CC, Volkswagen Passat, Volkswagen Passat CC, or Audi S6 models. This part cross-references Bosch (e.g., 17071, 17324) for the same application.

Common Problems This Part Can Address

• Check engine light related to air/fuel ratio sensor performance
• Rough idle caused by inaccurate upstream exhaust feedback
• Fuel trim issues from a slow or failing heated sensor
• Emissions test failure tied to sensor response problems
• Driveability concerns on Volkswagen CC, Passat, Passat CC, or Audi S6 applications

Installation Notes

Verify the connector style, wire count, thread diameter, and upstream left or upstream location before installation. Route the harness to match the original path and inspect the exhaust bung threads for damage or contamination before threading in the sensor. For best results, confirm the vehicle application by year, make, model, and position before ordering.

Quality Assurance

Denso manufactures and tests this OE Style sensor to strict original-equipment standards for consistent fit and performance. The part number 234-5118 is built as a specific-fit replacement for the listed Volkswagen and Audi applications.