Bosch 13146 Oxygen Sensor - Upstream

Bosch Actual OE Oxygen Sensor 13146

Bosch 13146 is a specific-fit, narrow-band heated oxygen sensor built for upstream air-fuel ratio feedback. It is engineered for Mercedes-Benz 300CE, 300E, 300TE, 300SE, and 300SEL applications from 1990-1992, including 1991 300E models with 3-wire leads.

Key Features

• Specific-fit Bosch Actual OE Oxygen Sensor for direct application matching
• Narrow-band heated O2 sensor for closed-loop fuel control
• 3-wire design with included wiring harness
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Rectangle/round connector style with blade pin terminals
• Metal housing and high-temperature-resistant construction for demanding exhaust conditions
• Upstream sensor position for Mercedes-Benz fuel management feedback

Product Details

Bosch 13146 uses a switching-type sensing element to send precise air-fuel-ratio data to the ECU, helping the engine maintain stable combustion control and emissions performance. Bosch’s Actual OE Oxygen Sensor line draws on decades of OE development, including narrowband planar sensor design improvements that support faster light-off and quicker closed-loop operation. For Mercedes-Benz 300CE, 300E, 300TE, 300SE, and 300SEL models, this upstream oxygen sensor is a direct replacement built around the original application requirements.

This part cross-references Bosch 0095429117 for the same application.

Common Issues This Part Can Help Resolve

• Rich or lean fuel mixture readings caused by a worn upstream O2 sensor
• Check engine light related to oxygen sensor performance
• Rough idle or unstable closed-loop fuel control
• Increased exhaust emissions from inaccurate air-fuel feedback
• Delayed sensor response during warm-up and normal driving

Installation Notes and Tips

Install Bosch 13146 in the upstream exhaust location specified for the vehicle. Verify the 18 mm thread size, 22 mm hex, and 3-wire connector style before installation. Because this is a specific-fit sensor, compare the harness length and connector shape to the original unit on the Mercedes-Benz 300CE, 300E, 300TE, 300SE, or 300SEL before final fitment.

Quality Assurance

Bosch supplies this Actual OE Oxygen Sensor using OE-proven engineering and durable materials developed for high heat and vibration exposure. The design reflects Bosch’s long history in oxygen sensor development and aftermarket replacement parts for precise emissions control.