Bosch Oxygen Sensor Heated Pre-Catalytic Converter

Bosch heated oxygen sensors for the pre-catalytic converter position, also called upstream O2 sensors or air-fuel ratio sensors, measure the oxygen content in the exhaust gas ahead of the catalytic converter. They send this signal to the engine control unit (ECU). The ECU uses it to fine-tune the fuel mixture for efficient combustion, lower emissions, and good fuel economy and drivability.

Key Features:

• Built-in heating element brings the sensor to operating temperature quickly, so closed-loop fuel control starts sooner after a cold start
• Designed for the upstream (pre-cat) sensor position, where precise exhaust readings matter most
• Sensing element and housing are built to withstand heat, vibration, and exhaust contaminants
• Manufactured to meet OE specifications for consistent, accurate signal output
• Many versions come with a pre-attached connector and wiring harness, which makes installation simpler

A worn or failing oxygen sensor can cause a check engine light, rough idle, poor fuel economy, and higher emissions. Replacing it with a Bosch sensor helps restore proper engine management. Bosch is a long-time OE supplier and pioneered the automotive oxygen sensor. Choose the specific part number for your application from the options in this product line.