J.C. Whitney JRM96090008 Downstream Heated Oxygen Sensor 4-Wire OEM Replacement

The J.C. Whitney JRM96090008 is a direct-fit, OEM-replacement downstream oxygen sensor designed for the 1996–2000 Mazda Miata. This heated, 4-wire oxygen sensor restores proper exhaust monitoring function, helping maintain optimal fuel trim, emissions compliance, and fuel economy.

Key Features:

• Downstream (post-catalytic converter) placement — monitors catalytic converter efficiency and exhaust gas composition
• Heated 4-wire design — integrated heater circuit allows the sensor to reach operating temperature quickly, improving cold-start performance and accuracy
• OEM replacement spec — matches original equipment specifications for a direct plug-and-play installation
• Restores proper air/fuel ratio feedback — eliminates oxygen sensor-related check engine light codes
• Durable construction — built to withstand high exhaust temperatures and harsh under-vehicle conditions

A failing downstream oxygen sensor can trigger diagnostic trouble codes (DTCs), reduce fuel efficiency, and cause the vehicle to fail emissions testing. The JRM96090008 provides a reliable, cost-effective solution to restore your Miata's exhaust monitoring system to factory performance.