Bosch 13864 Oxygen Sensor - Upstream

Bosch OE Oxygen Sensor for Mercedes-Benz

Bosch 13864 is an Actual OE Oxygen Sensor built as a specific-fit, narrow-band heated replacement for select Mercedes-Benz applications. It provides the air-fuel ratio feedback the ECU uses to manage closed-loop operation, combustion stability, and emissions control.

For Mercedes-Benz S320 and SL320 owners, Bosch 13864 offers OE-style sensor construction with a threaded mount, round female connector, and integrated wiring harness for direct replacement service.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Part number 13864 for direct identification
• Narrow-band heated sensor design
• Specific fit with threaded mounting
• 4-wire configuration with pin terminals
• Round female connector and included wiring harness
• 22 mm hex size and 18 mm thread diameter
• Metal housing for high-temperature service

OE Sensor Line Details

Bosch’s Actual OE Oxygen Sensor line draws on the company’s long history in oxygen-sensor development, including early thimble-style designs and later planar narrowband technology. The result is a replacement sensor focused on accurate lambda feedback, faster warm-up, and stable closed-loop response under changing exhaust temperatures and vibration.

On Mercedes-Benz S320 and Mercedes-Benz SL320 applications, Bosch 13864 supports the ECU with precise switching-type signal output so the engine management system can maintain proper fuel control during normal driving and warm-up operation.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Rough idle caused by inaccurate air-fuel feedback
• Fuel trim issues from delayed or inconsistent sensor switching
• Emissions test failures tied to faulty upstream sensor readings
• Closed-loop operation problems after sensor aging or contamination

Installation Notes

Fits 1997-1999 Mercedes-Benz S320, Upstream. Fits 1997 Mercedes-Benz SL320, Upstream. This is a threaded, heated narrow-band sensor with a 4-wire harness and round female connector; verify connector style, thread size, and upstream location before installation. Use the correct oxygen-sensor socket for the 22 mm hex and confirm the exhaust bung is clean and undamaged.

This part cross-references Mercedes-Benz 0005409117 for the same application.

Quality Assurance

Bosch supplies this oxygen sensor as an OE-proven replacement backed by more than five decades of oxygen-sensor development and production experience. Bosch 13864 is built to deliver consistent signal accuracy and durable service in demanding exhaust conditions.