Bosch 11-78-1-310-838 Oxygen Sensor Pre-Catalytic Converter O2 Sensor

The Bosch 11-78-1-310-838 is an OEM oxygen sensor designed for BMW E30 vehicles with the S14 engine, mounted in the manifold before the catalytic converter. This genuine Bosch O2 sensor keeps your emissions system running smoothly while ensuring optimal engine performance and fuel efficiency.

Key Features:

• Pre-catalytic converter (upstream) oxygen sensor location
• OEM quality Bosch manufacturing for reliable performance
• Direct plug-in connector design with no cutting or splicing required
• Monitors exhaust oxygen levels for proper air-fuel mixture control
• Helps maintain optimal engine efficiency and reduce emissions

Bosch is one of the largest OEM producers of genuine BMW and aftermarket parts in the world, providing parts for almost every major automotive manufacturer and has likely supplied many of the original electrical parts for BMW vehicles. A new oxygen sensor can improve driveability and lengthen engine life, ultimately achieving a smoother running engine that is more fuel efficient.

The oxygen sensor provides critical feedback to the engine control unit (ECU) to maintain the ideal air-fuel ratio, enabling virtually complete combustion and reducing harmful emissions. Regular replacement of oxygen sensors is essential for maintaining peak engine performance and passing emissions testing.