O2 Sensor Downstream for Mazda3 and Mazda5 2004-2007
Upgrade your Mazda’s exhaust management with the O2 Sensor Downstream for Mazda3 and Mazda5 (2004-2007). This heated, piezoelectric downstream oxygen sensor from IWOKPHD is designed to monitor exhaust gas after the catalytic converter, helping your engine control unit maintain an accurate air-fuel ratio, improve emissions performance, and keep your vehicle running smoothly. Intended for Mazda3 models 2004-2005 and Mazda5 models 2006-2007, it serves as a direct replacement to restore proper sensor signaling.
Compatibility and part numbers you may encounter include: 234-4390, L3A1-18-861A, L3A1-18-861B, L3A1-18-861C, L3A1-18-861C9U, L3K2-18-861, L3K2-18-861A, L3K2-18-861B, L3K2-18-861B9U, LF68-18-861A, LF68-18-861B, LF68-18-861B9U, LF68-18-861C, LF68-18-861D, LF68-18-861D9U. The only way to be 100% sure the part fits your vehicle is to check your original part or send the part number/or photos to confirm before ordering. If you’re unsure which item fits, please contact us and we’ll check compatibility within 24 hours.
Benefits & Tips
- Helps the engine control unit optimize fuel trims and maintain catalytic converter efficiency by providing accurate downstream oxygen readings.
- Acts as a reliable direct replacement for Mazda3 2004-2005 and Mazda5 2006-2007, supporting smooth idle, improved throttle response, and better emissions performance.
- Tip: compare part numbers carefully with your original sensor and reference the provided list to confirm fit before purchase; for any doubt, reach out to our team for verification within 24 hours.
Product specifications
- Brand: IWOKPHD
- Sensor Type: Piezoelectric
- Type: Heating (heated) O2 sensor
- Application: FOR MAZDA 3 2004-2005; FOR MAZDA 5 2006-2007
- Part Numbers: 234-4390, L3A1-18-861A, L3A1-18-861B, L3A1-18-861C, L3A1-18-861C9U, L3K2-18-861, L3K2-18-861A, L3K2-18-861B, L3K2-18-861B9U, LF68-18-861A, LF68-18-861B, LF68-18-861B9U, LF68-18-861C, LF68-18-861D, LF68-18-861D9U
- Origin: Mainland China
Package includes
- 1 piece O2 sensor downstream
Warnings / reminders
- Please check the picture and the part number carefully to make sure that you bought the right part for your car.
- If you cannot be sure which item fits your car, please send the Part Number or the original product photos to us to confirm before order.
- The only way to be 100% sure that the part will fit your vehicle is to check your original part. We will check for you and reply within 24 hours.
All electronic and mechanical equipment, devices and machines sold by InterCyprus to EU countries are CE certified and carry a two year warranty.
At intercyprus.com since 2002 — trusted for quality and reliability.