J.C. Whitney JRC96090017 Downstream Heated Oxygen Sensor 4-Wire OEM Replacement

The J.C. Whitney JRC96090017 is a direct-fit, OEM-replacement downstream oxygen sensor designed for Cadillac STS and CTS models. Positioned after the catalytic converter, this sensor monitors catalytic converter efficiency by measuring residual oxygen levels in the exhaust stream, feeding real-time data back to the engine control module (ECM) to help maintain proper emissions performance and fuel economy.

Key Features:

• 4-Wire Heated Design: Integrated heater circuit brings the sensor to operating temperature quickly, ensuring accurate readings even during cold starts and short trips
• Downstream (Post-Catalyst) Position: Monitors catalytic converter performance and helps detect converter degradation before it becomes a costly repair
• Direct-Fit OEM Replacement: Engineered to match original equipment specifications for a plug-and-play installation — no splicing or modification required
• Threaded-In Mounting Style: Standard M18 x 1.5 thread for secure installation using an O2 sensor socket
• Restores Check Engine Light Codes: Resolves diagnostic trouble codes related to downstream O2 sensor circuit faults (e.g., P0141, P0161, P0420, P0430)

This sensor is sold individually. An O2 sensor removal socket is recommended for installation to avoid damaging the wiring harness or sensor body during removal and reinstallation.