J.C. Whitney REPM960932 Upstream Oxygen Sensor 4-Wire Heated 2.4L 4-Cylinder

The J.C. Whitney REPM960932 is a direct-fit, OEM-replacement upstream (air/fuel ratio) oxygen sensor engineered for Mitsubishi 2.4L four-cylinder applications. Positioned before the catalytic converter, this upstream O2 sensor continuously monitors exhaust gas oxygen content, allowing the engine control module (ECM) to precisely adjust the air/fuel mixture for optimal combustion efficiency, fuel economy, and emissions compliance.

This is a heated, 4-wire oxygen sensor, meaning it reaches operating temperature quickly after cold starts — reducing the time the ECM must rely on open-loop fueling and helping to minimize cold-start emissions. The four-wire design includes two heater circuit wires and two signal wires for reliable, fast-response operation.

Key Features:

• Direct OEM replacement — designed to match original fit, form, and function
• Upstream (pre-catalytic converter) sensor position
• Heated 4-wire design for rapid warm-up and accurate signal output
• Compatible with 2.4L inline four-cylinder engines
• Helps restore proper air/fuel ratio management and eliminate oxygen-sensor-related fault codes
• Supports fuel efficiency and emissions performance

Installing a fresh oxygen sensor is one of the most effective ways to resolve a Check Engine Light caused by sensor degradation, slow response times, or heater circuit failure. The REPM960932 restores closed-loop fuel control so the engine runs cleanly and efficiently.