J.C. Whitney JARBM960920 Heated 4-Wire Upstream Oxygen Sensor OEM Replacement

The J.C. Whitney JARBM960920 is an OEM-replacement heated 4-wire upstream oxygen sensor designed to restore proper air/fuel ratio monitoring and emissions performance. This sensor is engineered to match original equipment specifications, ensuring a reliable, drop-in fit without modifications.

Upstream oxygen sensors (also called pre-cat or air/fuel ratio sensors) monitor exhaust gases before they reach the catalytic converter, feeding real-time data to the engine control module (ECM) to optimize fuel delivery and combustion efficiency. A failed upstream O2 sensor commonly triggers a Check Engine Light, causes poor fuel economy, rough idle, and increased emissions.

Key Features:

• Heated 4-wire design — integrated heater circuit reaches operating temperature faster for tighter closed-loop fuel control, even during cold starts
• OEM-replacement quality — manufactured to match original equipment fit, form, and function
• Upstream (pre-catalytic converter) placement — monitors exhaust oxygen content before the catalyst for precise ECM feedback
• Direct-fit connector — plug-and-play installation using the factory wiring harness connector
• Durable construction — resistant to high exhaust temperatures and vibration for long service life

This oxygen sensor is a cost-effective solution for restoring accurate emissions monitoring and fuel efficiency to your vehicle's engine management system.