Bosch 11-78-7-539-125 Premium Oxygen Sensor

The Bosch 11-78-7-539-125 is a premium original equipment oxygen sensor designed for high-performance vehicles. As the inventor of the automotive oxygen sensor, Bosch delivers unmatched quality and reliability in emissions control technology.

Key Features:

• Original equipment quality from the world's leading oxygen sensor manufacturer
• Fast-acting heater reaches operating temperature within seconds for optimum performance
• Double laser-welded stainless steel body is totally submersible and sealed tight against exhaust emissions
• Threads pre-coated with anti-seize compound for hassle-free installation
• Direct-fit OE connectors and harnesses for simple plug-and-play installation
• 100% tested for full functionality to ensure superior performance
• Post-catalytic converter position (rear/downstream sensor)

Oxygen sensors monitor exhaust oxygen levels to help the engine control unit maintain the ideal air-fuel ratio of 14.7:1. A properly functioning O2 sensor improves fuel economy, reduces harmful emissions, maximizes engine performance, and prevents check engine light codes. The ceramic element design ensures long-lasting accuracy even under continuous exposure to extreme exhaust temperatures.

Cross Reference Numbers: Bosch 16421, BMW 11787539125, 0258006793, 11780416260