Denso 234-3105 Oxygen Sensor - Upstream

OE-Style Oxygen Sensor for Mercedes-Benz

This Denso OE Style oxygen sensor is a direct-fit replacement built for precise signal control and a first-time fit. It is engineered for the upstream position on select Mercedes-Benz 300SL and 500SL applications, including the Denso 234-3105 part number.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for direct replacement installation
• 3-wire configuration with female connector
• Threaded mounting with 0.708 in. thread diameter
• 17.72 in. wiring harness length for application-specific routing
• OE-style construction for accurate sensor placement and fit

Product Details

Denso 234-3105 is part of the OE Style line, which focuses on exact replacement geometry and application-specific fitment. Denso builds and tests these oxygen sensors to OE standards, and the sensor uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination. That design supports stable engine management, fuel efficiency, and long service life in the exhaust stream.

Compatible with 1990-1993 Mercedes-Benz 300SL, upstream, and 1990-1992 Mercedes-Benz 500SL, upstream, this sensor is a direct option when replacing a worn or slow-responding upstream unit. The Denso 234-3105 is also a useful cross-reference for select OE-style replacement searches.

This part cross-references Bosch (e.g., 13152, 13160) for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rich or lean fuel mixture readings from a failing upstream sensor
• Reduced fuel economy caused by inaccurate exhaust feedback
• Slow sensor response during closed-loop engine operation
• Driveability issues tied to contaminated or aging sensor elements

Installation Notes and Tips

Install the sensor in the upstream exhaust location specified for the vehicle. Confirm connector style, wire count, thread diameter, and harness length before installation to match the original routing and mounting point. Because this is a specific-fit sensor, verify the application against the vehicle year, model, and position before ordering.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for consistent fit and performance. The OE Style line is built for direct replacement use on the listed Mercedes-Benz applications, including 1990-1993 Mercedes-Benz 300SL and 1990-1992 Mercedes-Benz 500SL.