J.C. Whitney JM960931 Heated 4-Wire Downstream Oxygen Sensor OEM Replacement

The J.C. Whitney JM960931 is a direct-fit OEM replacement oxygen sensor designed to restore proper exhaust monitoring and fuel management to your vehicle. This is a heated, 4-wire downstream (post-catalytic converter) sensor, engineered to match the original equipment specifications for a reliable, plug-and-play installation.

Downstream oxygen sensors play a critical role in monitoring catalytic converter efficiency and ensuring your engine management system maintains optimal air/fuel ratios. A failed or degraded O2 sensor can trigger a check engine light, reduce fuel economy, and lead to failed emissions tests — making timely replacement essential.

Key Features:

• OEM Replacement: Designed to meet or exceed original equipment specifications for a precise fit and function
• Heated Design: Built-in heater element allows the sensor to reach operating temperature quickly, improving cold-start performance and emissions accuracy
• 4-Wire Construction: Two heater wires and two signal wires for accurate, stable air/fuel ratio readings
• Downstream Position: Monitors catalytic converter efficiency downstream of the cat for accurate emissions system diagnostics
• Direct Fit: Plug-and-play replacement requiring no splicing or modification

The J.C. Whitney JM960931 oxygen sensor is built to restore peak engine performance, fuel efficiency, and emissions compliance. Compatible with select Mercedes-Benz C-Class (2001–2006) and M6 (2012–2018) applications — always verify fitment using your vehicle's year, make, model, and engine before ordering.