Bosch Oxygen Sensor Heated Pre-Cat

The Bosch heated oxygen sensor (O2 sensor) for pre-catalytic converter (upstream) placement monitors the oxygen content in your engine's exhaust and sends that data to the engine control unit. The ECU uses the signal to fine-tune the air-fuel mixture. Bosch pioneered the oxygen sensor and supplies it as original equipment to many automakers worldwide.

Key Features:

• Pre-cat (upstream) design mounts ahead of the catalytic converter to provide air-fuel ratio feedback
• Integrated heating element brings the sensor to operating temperature quickly, enabling closed-loop fuel control sooner after a cold start
• Helps maintain proper fuel economy, drivability, and emissions performance
• Built to OE-level quality standards for accurate, reliable signal output
• Pre-installed connector and wiring harness on most applications for simpler installation

A worn or failing upstream oxygen sensor can cause a check engine light, poor fuel economy, rough idle, and increased emissions. Replacing it with a Bosch sensor helps restore correct engine management. Choose the correct part number for your application from the available variants.