Bosch 13049 Oxygen Sensor - Upstream

Bosch Actual OE Oxygen Sensor 13049

Bosch 13049 is a narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the ECU. It supports stable combustion control and emissions management for select BMW applications, including BMW M5, BMW M6, 325e, 325es, 535i, 635CSi, and 735i upstream locations.

Key Features

• Actual OE Oxygen Sensor from Bosch Actual OE Oxygen Sensor line
• Narrow-band heated oxygen sensor for upstream exhaust monitoring
• Specific-fit design with threaded mounting and 18 mm thread size
• 3-wire configuration with round connector and blade pin terminals
• Wiring harness included with a 66.8 in harness length
• Metal housing with mounting bracket included
• OE-style replacement for BMW oxygen sensor service needs

Product Details

Bosch 13049 uses a switching-type sensing element to measure exhaust oxygen content and send accurate feedback to the engine control unit. Bosch developed this sensor family from its long-running OE oxygen sensor engineering, including planar narrowband designs that improve light-off response, lambda accuracy, and closed-loop operation. For drivers servicing a BMW M5 oxygen sensor, BMW M6 upstream oxygen sensor, or a Bosch 13049 replacement for older BMW 3, 5, 6, and 7 Series applications, this part is built to match the original sensor style and operating requirements.

This part cross-references BMW OE numbers 11621308366 and 11621308367 for the same application.

What It Helps Address

• Faulty upstream oxygen sensor readings
• Rich or lean fuel mixture codes
• Rough idle caused by inaccurate air-fuel feedback
• Increased exhaust emissions from delayed sensor response
• Check engine light concerns related to oxygen sensor performance

Installation Notes and Tips

Install Bosch 13049 in the upstream exhaust position only where listed in the fitment data. Confirm the 18 mm threaded mounting point, round connector style, and 3-wire harness layout before installation. Because oxygen sensors operate in high-heat exhaust conditions, inspect the connector, wiring route, and surrounding exhaust components for damage or contamination during replacement.

• Fits 1988 BMW M5, Upstream
• Fits 1987-1988 BMW M6, Upstream, Cylinder(s) 1, 2, and 3
• Fits 1987-1988 BMW M6, Upstream, Cylinder(s) 4, 5, and 6
• Fits 1984-1987 BMW 325e, Upstream
• Fits 1986-1987 BMW 325es, Upstream
• Fits 1985-1987 BMW 535i, Upstream
• Fits 1985-1987 BMW 635CSi, Upstream
• Fits 1985 BMW 735i, Upstream

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development in emissions and engine management sensing. The sensor uses advanced ceramic elements, optimized heater control, and high-temperature-resistant materials to maintain consistent operation under thermal and vibration load.