Bosch 11-78-7-558-055 Premium Wideband Air/Fuel Ratio Oxygen Sensor

The Bosch 11-78-7-558-055 is a premium wideband air/fuel ratio oxygen sensor engineered with OE-identical specifications for direct-fit replacement. Unlike standard oxygen sensors that simply switch between rich and lean readings, this advanced wideband sensor precisely measures the exact amount of oxygen in the exhaust, providing proportional feedback to the vehicle's ECU for optimal air-fuel mixture control.

Key Features:

• 5-wire heated wideband air/fuel ratio sensor with zirconium sensing element
• 18mm threaded mounting with threads pre-coated in anti-seize compound for easy installation
• 1400mm (55.1-inch) wire harness length with true OE-type connector
• Fast-acting heater reaches operating temperature within seconds for immediate performance
• Double laser-welded stainless steel body is fully submersible and sealed against exhaust emissions
• 100% functionally tested (seared protection tube appearance confirms quality control)
• Cross-reference: Bosch 17098, OEM 11787558055

Bosch invented the automotive oxygen sensor and remains the world's leading OE manufacturer. This sensor helps maintain the ideal 14.7:1 air-fuel ratio for complete combustion, improving fuel economy, reducing emissions, and protecting your catalytic converter from premature failure. Replacing a worn oxygen sensor at recommended intervals prevents long-term engine damage and ensures your vehicle runs efficiently while minimizing harmful emissions.