Bosch 15088 Oxygen Sensor - Upstream Left

Bosch OE Oxygen Sensor for Mercedes-Benz

Bosch 15088 is an Actual OE Oxygen Sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management for select Mercedes-Benz applications, including upstream left locations on C280, C43 AMG, CLK320, and CLK430 models.

Key Features

• Specific-fit narrow-band heated oxygen sensor
• 4-wire design with pin terminals and round female connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included for direct replacement use
• Metal housing with high-temperature-resistant construction
• Wiring harness length: 29.6 in; overall length: 33.3 in

Product Details

This Bosch Actual OE Oxygen Sensor, part number 15088, uses a narrow-band heated design to deliver accurate lambda feedback under changing engine loads and temperatures. Bosch developed its oxygen sensor technology from early OE thimble designs to planar narrowband sensors that improve light-off response, closed-loop operation, and measurement accuracy. For Mercedes-Benz C280, C43 AMG, CLK320, and CLK430 applications, Bosch 15088 provides the OE-style sensor response expected for upstream left placement.

This part cross-references Mercedes-Benz 0015400817 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings at the ECU
• Rough idle or unstable combustion control from aging sensor output
• Slow closed-loop response after startup
• Emissions test failures caused by degraded sensor accuracy

Installation Notes

Install Bosch 15088 in the threaded upstream left position specified for the vehicle application. Verify connector style, wire count, and sensor location before installation. Use proper oxygen sensor service tools for removal and tightening, and confirm the harness routing keeps the lead away from exhaust heat and moving components.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development and aftermarket supply experience. The sensor is engineered to meet OE-level expectations for accuracy, durability, and thermal resistance in demanding operating conditions.