Oxygen Sensor for Mazda RX-8 4-Wire N3H1-18-861B Direct Replacement Fits 2003-2012
Keep Mazda RX-8 running cleanly and efficiently with this 4-wire Oxygen Sensor OEM N3H1-18-861B from WEIDA AUTO PARTS. Designed as a direct replacement for the exhaust sensing element, this sensor delivers accurate feedback to your engine control unit, helping to optimize fuel delivery, reduce emissions, and maintain steady idle and performance across a wide range of driving conditions. Built to endure the heat and harsh environment of the exhaust system, this sensor is a reliable choice for 2003–2012 Mazda RX-8 models with the 2.6L engine.
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Benefits & Tips
- Restore optimal air-fuel mixture: a precise oxygen sensor reading helps the ECU adjust fuel trim for stronger throttle response and better fuel economy.
- Emission control and inspection readiness: a healthy sensor supports lower tailpipe emissions, helping you pass local emissions tests with confidence.
- Easy compatibility and maintenance: as a direct OEM replacement with a 4-wire design, installation is straightforward for qualified technicians and avoids unnecessary wiring changes.
Product specifications
- OEM No.: N3H1-18-861B
- Brand: WEIDA AUTO PARTS
- Sensor type: Magnetic Induction
- Hysteresis: DOX-0330
- Measuring range: N3H1-18-861B; N3H3-18-861B
- Configuration: 4-wire
- Origin: Mainland China
- Compatibility: Mazda RX-8 2.6L (2003–2012)
Package includes:
- 1 x Oxygen Sensor (4-wire) OEM N3H1-18-861B
Warnings/Reminders
- Install by a qualified technician. Disconnect the vehicle battery and allow the exhaust system to cool before service.
- Ensure proper sealing of the sensor thread and connector to prevent exhaust leaks and signal corrosion.
- Follow vehicle-specific service manuals for torque specs and sensor handling to maximize longevity.