Bosch 16475 Oxygen Sensor - Downstream

Bosch OE Oxygen Sensor for Mercedes-Benz C230

Bosch 16475 is a narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the engine control unit. It is a specific-fit replacement for 2003-2005 Mercedes-Benz C230 downstream applications and is engineered for stable closed-loop fuel control and emissions monitoring.

The Bosch Actual OE Oxygen Sensor line reflects Bosch’s long OE development history, including narrowband sensor designs with fast light-off response, accurate lambda measurement, and reliable heater control under demanding exhaust temperatures.

Key Features

• Specific-fit oxygen sensor for downstream placement
• Narrow-band heated sensor design for closed-loop fuel control
• 4-wire configuration with included wiring harness
• Round female connector with pin terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing for high-temperature exhaust service
• Wiring harness length: 23.2 in; overall length: 26.6 in

Detailed Description

Bosch part number 16475 is an Actual OE Oxygen Sensor for the 2003-2005 Mercedes-Benz C230, downstream. It measures exhaust oxygen content and sends the signal needed for the ECU to maintain the correct air-fuel mixture during normal driving and emissions-related operation. The narrow-band heated design supports quicker closed-loop operation after startup and consistent signal output across changing exhaust conditions.

This Bosch 16475 oxygen sensor uses a threaded mount, female connector, and included harness for a direct replacement layout. It is a standard replacement part for drivers and technicians servicing Mercedes-Benz C230 downstream sensor faults, drivability concerns, or emissions-related diagnostic codes.

This part cross-references Mercedes-Benz OE 0025400617 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rough idle or unstable air-fuel control
• Fuel trim issues caused by inaccurate exhaust feedback
• Failed emissions inspection tied to downstream sensor faults
• Slow sensor response after warm-up

Installation Notes and Tips

Verify downstream placement before installation on the Mercedes-Benz C230. Confirm connector shape, wire count, thread size, and harness length against the original sensor. Use the correct oxygen sensor socket for the 22 mm hex and inspect the exhaust bung threads before tightening the new sensor.

Quality Assurance

Bosch supplies OE and aftermarket oxygen sensors based on decades of original-equipment development. Bosch 16475 is built to OE-style specifications for accurate signal delivery, heater performance, and durable operation in high-heat exhaust environments.