Bosch 11-78-7-512-002 Premium OE Oxygen Sensor

The Bosch 11-78-7-512-002 is a premium original equipment-type oxygen sensor designed for select BMW vehicles. This downstream oxygen sensor (Bank 2, Sensor 2) monitors exhaust oxygen levels to help optimize fuel economy while reducing harmful emissions.

Key Features:

• 4-wire heated planar sensor with 18mm thread diameter
• Wire length: 16.5 inches (419mm) for proper reach
• Direct-fit OE connector for easy installation
• Pre-coated threads with anti-seize compound included
• Double laser-welded stainless steel body protects against contamination
• Fast-acting heater reaches operating temperature within seconds
• 100% functional quality tested before leaving factory
• Zirconium sensor element for accurate readings

Bosch invented the automotive oxygen sensor in the late 1960s and remains the world's leading supplier of O2 sensors. This sensor helps the engine control unit fine-tune the air/fuel mixture to optimal levels, ensuring maximum catalyst efficiency and long service life. A worn-out oxygen sensor can cause excessive fuel consumption, elevated emissions, reduced engine performance, and shortened catalytic converter life.

OEM Part Number: 11787512002, 11 78 7 512 002

Bosch Part Number: 15321

Position: After catalytic converter (Cylinders 5-8)