Mopar Oxygen Sensor Before Catalyst

The Mopar Oxygen Sensor Before Catalyst is an upstream O2 sensor (also called a pre-cat oxygen sensor or air/fuel ratio sensor). It is mounted ahead of the catalytic converter. It measures the oxygen content in the engine's exhaust and sends that data to the powertrain control module (PCM).

Key Features:

• Upstream position, before the catalytic converter, to monitor exhaust oxygen levels
• Sends real-time feedback to the PCM so it can adjust fuel delivery and keep the air/fuel mixture correct
• Helps maintain fuel economy, smooth engine operation and emissions control
• Genuine Mopar part, made to factory specifications for dependable fit and function
• Sold in left and other position-specific versions, each with its own part number

A worn or failing upstream oxygen sensor can cause a check engine light, poor fuel economy, rough idle or failed emissions tests. Replacing it with a Mopar sensor helps restore the engine management performance the vehicle was designed to deliver.