J.C. Whitney JARBK960904 Heated Downstream Oxygen Sensor 4-Wire OEM Replacement

The J.C. Whitney JARBK960904 is a heated, 4-wire downstream oxygen sensor designed as a direct OEM replacement. This sensor monitors exhaust gases after the catalytic converter, providing critical feedback to the engine control unit (ECU) to help maintain optimal fuel trim, reduce emissions, and protect catalytic converter efficiency.

Key Features:

• Heated Design: Built-in heater element allows the sensor to reach operating temperature quickly, improving accuracy during cold starts and short trips
• 4-Wire Configuration: Two heater wires and two signal wires for reliable, precise oxygen level measurement
• Downstream (Post-Catalyst) Position: Monitors catalytic converter performance and supports OBD-II emissions readiness
• OEM Replacement: Engineered to match original equipment specifications for a direct fit and factory-level performance
• Durable Construction: Built to withstand high exhaust temperatures and harsh underhood environments

This oxygen sensor is a straightforward replacement for the factory unit, restoring proper closed-loop fuel control, eliminating check engine light codes related to the downstream O2 sensor circuit, and helping maintain emissions compliance.