Oxygen Sensor Package – Mopar (5139021aa)

The Mopar Oxygen Sensor Package listed here carries part number 5139021aa and installs where the original was removed. Fitted in place of the original, it replaces a sensor that has gone slow, lazy or open circuit. Catalogue application notes: After catalyst rear. Match 5139021aa to the number on the failed component. Count the pins or check the connector keyway if two numbers look interchangeable. Ships from our US warehouse.