Denso 234-5091 Air / Fuel Ratio Sensor - Upstream, Upstream Left or Upstream Right

Denso OE Style Air/Fuel Ratio Sensor 234-5091

Denso 234-5091 is an OE Style heated air/fuel ratio sensor built for specific-fit replacement on select Mercedes-Benz and Dodge Sprinter applications. It is engineered and tested to OE standards for accurate signal response and a first-time fit.

For drivers searching for a Mercedes-Benz SLS AMG upstream air/fuel ratio sensor or a Dodge Sprinter 2500 upstream sensor replacement, this Denso part number 234-5091 provides the correct OE-style configuration for the listed applications.

Key Features

• Heated air/fuel ratio sensor for upstream exhaust placement
• Specific fit design for direct replacement on listed vehicles
• 5-wire configuration with male connector
• 31.50 in. wiring harness length
• Thread diameter: 0.711
• Built to OE standards for accurate replacement fit and function
• OE Style product line focused on direct-fit replacement geometry

Detailed Description

Denso OE Style sensors are precision-built to match original equipment dimensions and electrical requirements. This heated air/fuel ratio sensor is designed for upstream locations on select Mercedes-Benz models including SLS AMG, SL63 AMG, CLS63 AMG, E63 AMG, CL63 AMG, S63 AMG, SLK300, SLK350, CLK350, CLK550, CLK63 AMG, E300, E350, E550, E63 AMG, ML450, C230, C280, C350, and E280, as well as Dodge Sprinter 2500 and Sprinter 3500 applications listed in the fitment data.

This part cross-references Bosch 17019 for the same application. It is also listed against Mercedes-Benz 0035427118 in interchange data.

What It Helps Address

• Check engine light related to upstream air/fuel ratio sensor faults
• Incorrect air-fuel mixture readings from a worn sensor
• Rough idle or drivability issues tied to sensor signal degradation
• Failed emissions testing caused by sensor performance problems
• Hard starting or fuel trim concerns linked to inaccurate exhaust feedback

Installation Notes and Tips

Verify the connector style, wire count, and upstream position before installation. This sensor is a specific-fit part, so confirm the vehicle year, model, and side designation where listed, especially on Mercedes-Benz applications with left or right upstream placement and chassis/date notes. Use the exact fitment row for your vehicle rather than relying on model name alone.

For search accuracy, this part is commonly referenced as Denso 234-5091 and as an OE Style upstream air/fuel ratio sensor for Mercedes-Benz and Dodge Sprinter applications.

Quality Assurance

Denso manufactures and tests these sensors to OE standards, with precision-built construction intended to match original replacement requirements and support proper fit on the first installation.