Bosch 13477 Oxygen Sensor - Upstream

Bosch OE Oxygen Sensor for BMW and Land Rover

Bosch 13477 is an Actual OE Oxygen Sensor built for precise air-fuel-ratio feedback to the ECU. It uses a narrow-band heated design with a threaded mount and integrated wiring harness for direct replacement on select BMW and Land Rover applications.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Narrow-band heated sensor for faster closed-loop operation
• Specific fit design with 4-wire, pin-terminal connector
• Round female connector with included wiring harness
• Threaded mounting with 18 mm thread size and 22 mm hex
• Steel-finish metal housing for high-temperature service
• Wiring harness length: 8.9 in; overall length: 12.6 in

Product Details

Bosch 13477 is engineered to measure exhaust oxygen content accurately so the engine control module can maintain stable combustion control and emissions performance. Bosch’s OE oxygen sensor development includes early thimble-style designs and later planar narrowband technology, which supports quicker sensor light-off and more responsive lambda control. For BMW X3, BMW X5, BMW 325i, BMW 530i, and Land Rover Range Rover applications, this sensor provides the direct-fit configuration needed for upstream replacement service. This part cross-references URO 11781742050 for the same application.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Rough idle caused by inaccurate air-fuel feedback
• Reduced fuel control response during closed-loop operation
• Emissions test failures tied to upstream sensor faults
• Slow sensor switching from heat or age-related wear

Installation Notes and Tips

Install Bosch 13477 in the upstream position only where listed in the fitment data. Verify the connector shape, wire count, and threaded sensor location before installation. Because this is a heated narrow-band sensor, proper electrical connection and secure routing of the included harness are important for stable operation. Confirm vehicle-specific fitment for BMW X3, BMW X5, BMW 330i, and Land Rover Range Rover before ordering.

Quality Assurance

Bosch supplies this Actual OE Oxygen Sensor using OE-proven design principles, advanced ceramic sensing elements, optimized heater control, and high-temperature-resistant materials. The result is a replacement sensor built to deliver consistent signal accuracy under demanding thermal and vibration conditions.