Denso 234-5161 Air / Fuel Ratio Sensor - Upstream, Upstream Left or Upstream Right

Denso OE Style Air/Fuel Ratio Sensor

Denso 234-5161 is an OE Style heated air/fuel ratio sensor built for direct replacement on select Audi applications. It is engineered for specific fitment, with a 5-wire design, male connector, and a 24.61-inch wiring harness for a factory-style connection.

For drivers searching for an Audi A8 Quattro upstream air/fuel ratio sensor or an OE-style replacement for Audi S6, S7, S8, and RS7 applications, this Denso sensor is built to match the original configuration and restore accurate exhaust feedback.

Key Features

• Part number: 234-5161
• OE Style replacement sensor for specific-fit applications
• Heated sensor design for faster operating readiness
• 5-wire construction with male connector
• 24.61-inch wiring harness length
• Thread diameter: 0.711
• Regular grade type

OE Style Product Line

Denso’s OE Style line focuses on direct replacement parts built to the same standards used for original equipment service. This air/fuel ratio sensor is precision-built for exact replacement and first-time fit, helping simplify installation on the correct Audi upstream location.

Detailed Description

Denso 234-5161 is an upstream air/fuel ratio sensor for select Audi models, including A8 Quattro, RS7, S6, S7, and S8 applications. It is listed for upstream positions such as upstream left and upstream right where specified, and it is a direct-fit replacement for vehicles that require the OE-style sensor configuration. This part cross-references Bosch 17056 for the same application.

Use this sensor when you need a precise replacement for the original air/fuel monitoring component on 2013-2018 Audi A8 Quattro, 2014-2018 Audi RS7, 2013-2018 Audi S6, 2013-2018 Audi S7, and 2013-2018 Audi S8 applications listed in the fitment data.

What This Sensor Helps Address

• Check engine light related to air/fuel ratio sensor performance
• Incorrect upstream exhaust feedback readings
• Rough idle or drivability issues tied to sensor signal errors
• Fuel mixture control problems caused by a worn sensor
• Failed emissions-related sensor diagnostics

Installation Notes and Tips

• Verify the exact year, model, and upstream position before ordering.
• Confirm the connector style, wire count, and harness length match the original sensor.
• Inspect the exhaust bung and wiring route before installation.
• Clear diagnostic trouble codes after installation and confirm proper sensor operation.

Quality Assurance

Denso manufactures and tests this sensor to OE standards for consistent replacement performance. The precision-built design supports a first-time fit on the listed Audi applications, including Audi A8 Quattro, Audi S6, and Audi S8 fitments where the OE-style upstream sensor is specified.