DriveWire RS31870002 Upstream Air/Fuel Oxygen Sensor 4-Wire OEM Replacement

The DriveWire RS31870002 is a direct-fit, OEM-replacement upstream oxygen sensor designed for select Subaru Legacy, Outback, and Impreza models. Engineered to restore proper air/fuel ratio monitoring, this 4-wire sensor ensures your engine management system receives accurate exhaust gas feedback for optimal fuel delivery, emissions performance, and fuel economy.

Key Features:

• OEM Replacement – Designed as a direct drop-in replacement for the factory oxygen sensor, ensuring proper fit and function without modification
• 4-Wire Construction – Heated sensor design allows faster warm-up time and more precise readings across a wider range of operating temperatures
• Upstream (Air/Fuel) Sensor – Monitors exhaust gases before the catalytic converter, providing critical feedback to the ECU for fuel trim adjustments
• Restores Performance – Helps eliminate fault codes, rough idle, poor fuel economy, and failed emissions tests caused by a failing oxygen sensor
• Quality Construction – Built to meet or exceed OEM specifications for long-lasting, reliable performance

The DriveWire RS31870002 is a straightforward, plug-and-play solution for restoring your Subaru's oxygen sensor function. Whether you're addressing a check engine light or performing routine maintenance, this sensor delivers dependable OEM-level performance at an accessible price point.