J.C. Whitney JD960904 Heated 4-Wire Downstream Oxygen Sensor OEM Replacement

The J.C. Whitney JD960904 is a direct-fit OEM replacement oxygen sensor designed for the Dodge Caravan and Grand Caravan. This is a heated, 4-wire downstream (post-catalytic converter) oxygen sensor that restores proper exhaust monitoring and fuel trim feedback to the engine control module (ECM).

Downstream oxygen sensors — also referred to as post-cat O2 sensors or catalyst monitor sensors — are mounted after the catalytic converter. Their primary function is to measure catalytic converter efficiency and report data to the ECM, ensuring proper emissions compliance and preventing false check engine lights (CEL) related to catalyst performance codes such as P0420.

Key Features:

• Heated sensor design — integrated heater circuit reaches operating temperature faster, improving cold-start fuel management and reducing emissions
• 4-wire configuration — two heater wires and two signal wires for plug-and-play OEM compatibility
• Downstream / post-catalytic converter position — monitors catalytic converter efficiency
• OEM replacement quality — engineered to match original equipment specifications for accurate signal output
• Direct-fit design — installs using the factory connector and mounting thread, no splicing required

A failed downstream oxygen sensor can trigger a check engine light, cause failed emissions tests, and degrade fuel economy over time. The J.C. Whitney JD960904 restores OEM sensor performance and clears related diagnostic trouble codes (DTCs) when the root cause has been addressed.