Denso 234-4522 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor 234-4522

Denso 234-4522 is a heated, specific-fit oxygen sensor built for direct replacement in select Mercedes-Benz applications. It is engineered to match OE-style fit and electrical connection requirements for downstream monitoring on the SLS AMG and ML450.

The OE Style line is focused on exact replacement fitment and consistent sensor performance. Denso uses precision-built components and an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine operation and fuel control.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific-fit design for direct replacement installation
• 4-wire configuration with female connector
• Threaded mounting with 0.708 in. thread diameter
• Wiring harness length: 28.23 in.
• OE Style replacement for select Mercedes-Benz vehicles

Detailed Product Information

This Denso oxygen sensor, part number 234-4522, is designed for precise replacement in emissions control systems where accurate exhaust feedback is required. It is compatible with 2011-2015 Mercedes-Benz SLS AMG, downstream, and 2010-2011 Mercedes-Benz ML450, downstream. For buyers searching for a Mercedes-Benz SLS AMG downstream oxygen sensor or a Mercedes-Benz ML450 downstream O2 sensor, this OE-style unit provides the correct fit and connector layout for the listed applications. This part cross-references Bosch (e.g., 16114, 16691) for the same application.

Denso’s OE Style product line is built around factory-style dimensions and sensor response characteristics, making it a practical choice when replacing a worn or contaminated downstream sensor. The design supports accurate exhaust monitoring and helps maintain proper fuel management when the original sensor is no longer performing as expected.

Common Issues This Part May Address

• Check engine light related to downstream oxygen sensor faults
• Slow or inaccurate exhaust gas feedback
• Reduced fuel economy caused by a failing sensor signal
• Emissions test failure tied to sensor performance
• Rough running or drivability concerns linked to incorrect air-fuel data

Installation Notes and Tips

Verify connector style, thread size, and downstream location before installation. This is a specific-fit sensor, so it should be matched to the listed Mercedes-Benz SLS AMG and ML450 applications by year and position. Inspect the exhaust bung threads and wiring routing during replacement to ensure the sensor seats correctly and the harness follows the original path.

Quality Assurance

Denso manufactures and tests its oxygen sensors to OE standards for consistent replacement fitment and performance. The OE Style line is intended to deliver the correct part and fit for the listed vehicle applications, with contamination-resistant sensor protection built into the design.