J.C. Whitney JRJ96090001 Upstream Heated Oxygen Sensor OEM Replacement 4-Wire

The J.C. Whitney JRJ96090001 is an OEM replacement upstream heated oxygen sensor designed for the 4.7L V8 eight-cylinder engine application. This 4-wire heated O2 sensor installs in the upstream (pre-catalytic converter) position and features symmetrical fitment — the right-hand and left-hand sensors are identical, simplifying the replacement process.

The upstream oxygen sensor plays a critical role in your vehicle's engine management and emissions control system. Mounted to the exhaust manifold, the sensor monitors unburned oxygen levels in the exhaust stream and continuously reports this data to the engine control module (ECM), which uses it to fine-tune the air/fuel mixture for optimal combustion efficiency, fuel economy, and emissions output. A failed or degraded upstream O2 sensor can cause rough running, reduced fuel economy, elevated emissions, and illumination of the Check Engine light.

Key Features:

• Direct OEM replacement — no cutting, splicing, or modifications required
• Heated sensor design for faster warm-up and accurate readings at operating temperature
• 4-wire construction for reliable signal output
• Upstream (pre-cat / Bank sensor 1) position fitment
• Right-hand equals left-hand — single part number covers both sides
• Threaded mounting for secure exhaust manifold installation
• Designed to restore proper air/fuel ratio management and eliminate O2 sensor-related fault codes

This is a direct-fit replacement sensor built to OEM specifications. Proper oxygen sensor function is essential for maintaining engine performance, passing emissions inspections, and protecting your catalytic converter from damage caused by a rich-running condition.