Oxygen Sensor Upstream Air Fuel Ratio for Mazda RX-8

Upgrade your Mazda RX-8’s fuel management with this upstream oxygen sensor, a precise air-fuel ratio sensor designed to keep your engine running clean and efficiently. Built to monitor the real-time oxygen content in the exhaust, it provides critical feedback to the engine control unit so your RX-8 maintains an ideal balance between fuel economy and performance. With a heating type and a robust piezoelectric sensing element, this sensor reaches operating temperature quickly and delivers reliable readings even on cold starts, helping reduce emissions and improve throttle response across a range of driving conditions.

Compatible with Mazda RX-8 models from 2004 to 2008, including special editions and trims such as the 40th Anniversary Edition Coupe, Grand Touring, GS, GT, Sport, Touring, as well as the Base and Shinka variants from 2004–2008. This broad compatibility helps ensure you find a fit for your specific RX-8 configuration.

Please review the part numbers carefully to confirm you’re selecting the correct part for your vehicle. If you’re unsure which item fits your car, send the part number or the original product photos to us for confirmation before ordering. The only guaranteed way to confirm fit is to compare with your original part. We’ll check for you and reply within 24 hours.

Part Numbers include a wide range of equivalents to cover various RX-8 configurations: N3H3-18-8G1A, N3H3188G1A, N3H2-18-8G1B, N3H2188G1B, 2134368, 213-4368, 25673, 25054031, 250-54031, 234-9102, 2349102, 13771, 13 771, 13772, 13 772.

Benefits & Tips

• Maintains a precise air-fuel ratio for optimal combustion, supporting smoother idle and more responsive acceleration.
• Helps reduce fuel waste and lower emissions by providing accurate feedback to the engine management system.
• Heated operation ensures faster sensor warm-up, improving performance and fuel control especially on cold starts.

Product specifications

• Brand: IWOKPHD
• Sensor Type: Piezoelectric
• Heating Type: Heating Type
• Application: For MAZDA RX-8 2004-2008 (including 40th Anniversary Edition, Grand Touring, GS, GT, Sport, Touring, Base, Shinka variants)
• OEM No./Part Numbers: N3H3-18-8G1A, N3H3188G1A, N3H2-18-8G1B, N3H2188G1B, 2134368, 213-4368, 25673, 25054031, 250-54031, 234-9102, 2349102, 13771, 13 771, 13772, 13 772
• Origin: Mainland China
• Measuring Range: For Mazda RX-8 RX8 1.3L
• Sensor Type: O2 Oxygen Lambda Sensor
• Compatibility Years: 2003–2012 (per listing data)
• Warranty: 2 years

Package includes:

• 1 pcs

Warnings/Reminders

• Please check the picture and the part number carefully to ensure you bought the right part for your car.
• If you cannot determine which item fits your car, please send the Part Number or the Original product photos to us to confirm before ordering.
• The only guaranteed way to confirm fit is to check your original part. We will check for you and reply within 24 hours.

Language support

Language support not specified in the listing.

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