J.C. Whitney JARBM960909 Heated Downstream Oxygen Sensor 4-Wire OEM Replacement

The J.C. Whitney JARBM960909 is a heated, 4-wire downstream (after catalytic converter) oxygen sensor designed as a direct-fit OEM replacement. Positioned after the catalytic converter, this sensor monitors exhaust gas oxygen levels and reports data to the engine control unit to help maintain optimal fuel trim, emissions compliance, and fuel economy.

The integrated heating element allows the sensor to reach proper operating temperature quickly after a cold start, ensuring accurate air-fuel ratio feedback and minimizing the time the engine runs in open-loop mode. The threaded mounting design enables straightforward installation without special tools.

Key Features:

• Sensor Type: Heated oxygen sensor (HO2S)
• Wire Count: 4-wire configuration
• Position: Downstream — after catalytic converter
• Mounting Type: Threaded direct-fit installation
• Connector Gender: Male
• Sold: Individually
• Pre-coated threads for easier installation and removal
• Drop-in OEM replacement — no splicing or modification required

Replacing a faulty downstream oxygen sensor can resolve diagnostic trouble codes related to catalyst efficiency (such as P0420) and restore proper closed-loop engine management, helping improve fuel efficiency and reduce exhaust emissions.