URO 11787589121 Pre-Catalytic Oxygen Sensor Upstream

The URO 11787589121 is a high-quality pre-catalytic oxygen sensor designed for direct replacement in BMW vehicles equipped with N20 and N26 turbocharged engines. This upstream sensor mounts in the exhaust system before the catalytic converter to monitor oxygen levels in exhaust gases and optimize engine performance.

Key Features:

• Pre-catalytic (upstream) position - installs before catalytic converter
• 5-wire heated sensor design for accurate readings
• Wire harness length: 15.24 inches (387mm)
• Measures oxygen levels to help ECU optimize air-fuel mixture
• Direct-fit replacement for OEM part number 11787589121
• Manufactured by URO Parts to meet original equipment specifications

This oxygen sensor plays a critical role in your vehicle's emissions control system by relaying precise oxygen level data to the engine control unit. The ECU uses this information to fine-tune the air-fuel mixture for efficient combustion, which improves fuel economy, reduces harmful emissions, and enhances overall engine performance. A properly functioning oxygen sensor helps prevent poor fuel economy, rough idle, and increased emissions.

Cross-Reference Part Numbers: 0258027029, 234-5054, 24364