Bosch 11-78-7-558-087 Oxygen Sensor Bank 2 Pre-Cat Upstream

The Bosch 11-78-7-558-087 is a premium OEM-quality oxygen sensor designed for precise air/fuel ratio monitoring in automotive applications. This 1200mm length oxygen sensor is positioned upstream on bank 2 (cylinders 4-6) before the catalytic converter, providing critical data to the engine control unit for optimal engine performance and emissions control.

Key Features:

• Wideband air/fuel sensor technology that precisely measures the amount of oxygen in the exhaust with a sophisticated sensing element that provides proportional signals to the vehicle's ECU
• Direct fit OEM Bosch sensor that plugs directly into factory connector with no cutting or splicing required
• 1200mm (47.2 inch) wire length for proper reach and installation
• 5-wire heated sensor design for rapid response and accurate readings
• Manufactured in Germany to OE specifications by Bosch, the original developer of automotive oxygen sensor technology

Performance Benefits:

Oxygen sensors measure exhaust oxygen and their signals are used by the vehicle computer to adjust the air/fuel ratio and test vehicle emissions. A new oxygen sensor can improve drivability and lengthen engine life, while degraded oxygen sensors reduce engine performance and fuel efficiency, and increase harmful tailpipe emissions. They can also turn on the Check Engine Light and cause a car to fail an emissions test.

Cross References: Bosch 17102, 0258017102. Also known as Lambda Sensor or Air/Fuel Ratio Sensor.