Bosch 11-78-7-836-394 Wideband Oxygen Sensor

The Bosch 11-78-7-836-394 is a premium OE-type wideband oxygen sensor (also known as an air/fuel ratio sensor) designed to monitor exhaust oxygen levels for optimal engine performance and emissions control. As the original inventor of automotive oxygen sensors in the late 1960s, Bosch continues to set the industry standard for sensor technology and quality.

Key Features:

• Wideband planar sensing element measures exact oxygen levels rather than just rich/lean switching
• 5-wire heated sensor design reaches operating temperature within seconds for quick response
• 18mm threaded mounting with anti-seize compound pre-applied for easy installation
• 23-inch (585mm) wire length with true OE-type connector for direct plug-and-play fitment
• Double laser-welded stainless steel body fully sealed and submersible for maximum durability
• Zirconium sensing element tested to 100% functionality before shipping
• Fast-acting internal heater optimizes sensor performance in all conditions

This front/upstream oxygen sensor helps the engine control unit (ECU) maintain the correct air-to-fuel mixture in real time, improving fuel economy, reducing harmful emissions, and ensuring smooth engine operation. The robust construction and premium materials ensure long service life even under continuous exposure to extreme exhaust temperatures. Bosch part number 17051 cross-references to BMW OEM part number 11787836394.