Denso 234-5064 Air / Fuel Ratio Sensor - Upstream

Denso OE Style Air/Fuel Ratio Sensor 234-5064

Denso 234-5064 is an OE Style heated air/fuel ratio sensor built for precise replacement and first-time fit. It is engineered for direct replacement on select Mercedes-Benz applications, including upstream positions on C63 AMG, C63 AMG S, C250, and SLK250 models.

The OE Style line focuses on exact-fit replacement parts that follow original equipment standards for form, function, and connector layout. For buyers searching for a Mercedes-Benz C63 AMG upstream air/fuel ratio sensor or a Denso 234-5064 replacement, this sensor is built to match the application requirements closely.

Key Features

• Heated air/fuel ratio sensor for upstream exhaust placement
• Specific fit design for direct replacement on listed Mercedes-Benz vehicles
• 5-wire configuration with male connector
• Wiring harness length: 52.56
• Thread diameter: 0.711
• Built to OE standards for accurate fit and consistent replacement

Detailed Description

Denso 234-5064 is an emission control sensor designed for air/fuel mixture monitoring in the upstream location. It is a specific-fit, heated sensor with a 5-wire layout, male connector, and harness length engineered to match the original installation geometry. The OE Style designation reflects Denso’s focus on direct replacement parts that align with factory specifications for fit and function.

This part cross-references Bosch 17203 for the same application. It also cross-references Mercedes-Benz 0005423400 and 0065422718 for the same application.

Compatible with 2016-2018 Mercedes-Benz C63 AMG, upstream; 2015-2018 Mercedes-Benz C63 AMG S, upstream; 2012-2015 Mercedes-Benz C250, upstream; and 2012-2015 Mercedes-Benz SLK250, upstream. Common search terms include Mercedes-Benz C63 AMG upstream air/fuel ratio sensor, C250 heated oxygen sensor replacement, and SLK250 upstream sensor replacement.

What This Sensor Helps Address

• Check engine light related to air/fuel ratio sensor performance
• Incorrect fuel trim readings from a failing upstream sensor
• Rough idle or drivability issues tied to mixture feedback
• Emissions test failures caused by sensor response problems
• Slow or inaccurate exhaust mixture monitoring

Installation Notes and Tips

Confirm the connector style, wire count, and upstream position before installation. Match the thread diameter and harness length to the original sensor to avoid fitment issues. Because this is a specific-fit part, verify the vehicle year, model, and engine application against the listed Mercedes-Benz fitment before ordering.

Quality Assurance

Denso manufactures and tests this sensor to OE standards for replacement accuracy and consistent fit. The OE Style line is intended to provide the correct part and the correct fit on the first installation.