Bosch 11-78-7-558-073 Pre-Cat Oxygen Sensor

The Bosch 11-78-7-558-073 is an OEM-quality pre-catalytic converter oxygen sensor designed for BMW vehicles. This heated broadband planar probe sensor monitors exhaust gases before they enter the catalytic converter, providing critical data to the engine control unit (ECU) to optimize air-fuel mixture ratios for improved performance, fuel efficiency, and reduced emissions.

Key Features:

• Heated broadband planar probe design for fast response and accurate readings
• Pre-greased threads for easier installation and removal
• OEM quality manufactured by Bosch (part number 0258017099)
• Mounts in rear manifold position (cylinders 4-6) with 910mm cable length
• Monitors oxygen levels to ensure proper engine operation and emissions compliance

When your oxygen sensor fails, you may experience poor fuel economy, rough idling, hard starting, or a check engine light. Replacing a faulty O2 sensor with this genuine Bosch unit restores proper engine management, optimizes combustion efficiency, and helps your vehicle pass emissions testing. Cross-reference part numbers include BMW 11787558073, Bosch 0258017099, and various alternate formats.