J.C. Whitney JM960913 Downstream Heated Oxygen Sensor 4-Wire OEM Replacement

The J.C. Whitney JM960913 is a direct-fit, heated downstream oxygen sensor designed as an OEM-style replacement. Featuring a 4-wire configuration, this sensor includes a built-in heating element that allows it to reach operating temperature faster, enabling the engine to enter closed-loop fuel control more quickly for improved efficiency and lower emissions.

The downstream O2 sensor (also known as the rear oxygen sensor or post-catalytic sensor) monitors exhaust gas oxygen content after the catalytic converter. It relays a voltage signal to the Powertrain Control Module (PCM), which uses this data to evaluate catalytic converter efficiency and optimize the air-fuel ratio — helping prevent engine damage and reduce harmful emissions.

Key Features:

• Heated 4-wire design for fast warm-up and accurate closed-loop feedback
• Direct-fit OEM replacement — no cutting, splicing, or modifications required
• Threaded mounting style with M18x1.5 thread size
• Monitors post-catalytic exhaust oxygen levels to support emissions compliance
• Backed by J.C. Whitney's 1-year, unlimited-mileage warranty

This sensor is sold individually and is engineered to restore proper engine performance, maintain fuel economy, and support the vehicle's emissions control system. Installation requires disconnecting the battery, removing the old sensor with an O2 sensor socket, and torquing the new sensor to factory specification (27–33 ft-lbs).