Denso 234-5185 Air / Fuel Ratio Sensor - Upstream

Denso OE Style Air/Fuel Ratio Sensor

Denso 234-5185 is an OE Style heated air/fuel ratio sensor built for direct replacement on select Audi and Volkswagen applications. It is engineered for specific fitment, with a 5-wire design, male connector, and a 26.89 in. wiring harness length for a factory-style installation.

For drivers searching for an upstream air fuel ratio sensor for Volkswagen Tiguan, Atlas, or Audi Q3 applications, this Denso sensor is built to match the original configuration and connection style. The 234-5185 part number is also a direct reference for OE-style replacement needs on several turbocharged VW and Audi models.

Key Features

• Heated air/fuel ratio sensor for upstream placement
• Specific fit design for direct replacement applications
• 5-wire construction with male connector
• 26.89 in. wiring harness length
• 0.708 in. thread diameter
• OE Style line focused on factory-style replacement fitment

Product Details

Denso’s OE Style line is built around exact replacement fitment and OE-level testing. This sensor is precision-built to match the original sensor layout, helping simplify replacement on vehicles that require an upstream air/fuel ratio sensor rather than a universal part. The 234-5185 is listed for select Audi A3, A3 Quattro, S3, Q3, TT Quattro, and TTS Quattro models, as well as Volkswagen Golf R, GTI, Tiguan, Atlas, and Atlas Cross Sport applications.

This part cross-references Bosch (e.g., 17063, 17110) for the same application.

Vehicle Fitment

• Fits 2022-2024 Audi Q3, upstream
• Fits 2020-2024 Volkswagen Tiguan, upstream
• Fits 2020-2023 Volkswagen Atlas, upstream
• Fits 2020-2023 Volkswagen Atlas Cross Sport, upstream
• Fits 2022 Audi A3, upstream
• Fits 2022 Audi A3 Quattro, upstream
• Fits 2019 Audi A3 Quattro, upstream
• Fits 2022 Audi S3, upstream
• Fits 2017-2020 Audi A3, upstream
• Fits 2018-2019 Volkswagen Atlas, upstream
• Fits 2018-2019 Volkswagen Tiguan, upstream
• Fits 2015-2018 Audi A3 Quattro, upstream
• Fits 2015-2018 Audi S3, upstream
• Fits 2016-2018 Audi TT Quattro, upstream
• Fits 2016-2018 Audi TTS Quattro, upstream
• Fits 2015-2018 Volkswagen Golf R, upstream
• Fits 2015-2018 Volkswagen GTI, upstream

Common Replacement Uses

• Replacing a failed upstream air/fuel ratio sensor
• Addressing check engine light concerns tied to mixture monitoring
• Restoring proper fuel-trim feedback to the engine control system
• Correcting drivability issues caused by inaccurate sensor readings
• Replacing a worn or damaged factory-style sensor on Audi and Volkswagen models

Installation Notes

Verify connector style, wire count, thread diameter, and upstream location before installation. This sensor is a specific-fit replacement, so matching the vehicle application and original sensor configuration is important for proper installation. Confirm the exact model year and engine setup against the listed fitment before ordering.

Quality Assurance

Denso manufactures and tests this OE Style sensor to strict original-equipment standards, with precision-built components intended to deliver exact replacement fitment and consistent performance.