Bosch 11-78-7-576-673 Wideband Oxygen Sensor Upstream Pre-Catalyst

The Bosch 11-78-7-576-673 is a premium OEM-quality wideband air/fuel ratio sensor designed to optimize engine performance and fuel efficiency. This upstream oxygen sensor measures the concentration of oxygen in exhaust gases before the catalytic converter, allowing the engine control unit to precisely adjust the air-fuel mixture for optimal combustion and reduced emissions.

Key Features:

• Wideband sensing element for precise air/fuel measurement rather than simple rich/lean switching
• Double laser-welded stainless steel body provides superior durability and protection against exhaust emissions
• Fast-acting integrated heater reaches operating temperature within seconds for optimal performance
• 5-wire heated design with 18mm thread diameter and 22mm hex size
• Wire harness length of 29 inches (737mm) with direct-fit OE-type connector
• Threads pre-coated with anti-seize compound for easy installation
• 100% factory tested with seared protection tube appearance confirming full functionality

Manufactured by Bosch, the inventor of automotive oxygen sensors, this sensor utilizes advanced zirconium and yttrium oxide technology to withstand extreme exhaust conditions. A failing oxygen sensor can cause poor fuel economy, rough idle, engine misfires, increased emissions, and check engine light illumination. This direct replacement sensor restores proper emissions control and engine efficiency. Cross-reference part numbers include 17187 and 0258017187.