URO 11787545075 Rear Post-Cat Oxygen Sensor Bank 2 Lambda Monitor

The URO 11787545075 is a rear post-catalytic converter oxygen sensor (also known as a lambda monitor or O2 sensor) designed as a direct replacement for BMW applications. Positioned after the catalytic converter on the rear manifold serving cylinders 4–6, this sensor plays a critical role in monitoring exhaust emissions downstream of the catalyst to ensure optimal engine efficiency and emissions compliance.

This sensor carries OEM part number 11787545075 (also referenced as 11-78-7-545-075 and 11 78 7 545 075) and features a cable length of 490mm, distinguishing it from its front-manifold counterpart (11787545074, 560mm). It is engineered to deliver accurate post-cat exhaust readings, helping the engine control unit (ECU) evaluate catalytic converter performance and maintain proper air-fuel mixture regulation.

Key Features:

• Post-catalytic converter (downstream) oxygen sensor — Bank 2, rear manifold position
• Covers cylinders 4–6 on applicable inline-6 BMW engines
• 490mm lead wire length for proper routing and fitment
• Direct OEM replacement — plug-and-play installation
• Monitors catalytic converter efficiency and exhaust emissions
• Compatible with BMW N51, N52, N52N, N54, and N54T engine families
• Sold individually

Cross-reference part numbers: 11787545075 / 11-78-7-545-075 / 11 78 7 545 075 / 11.78.7.545.075