Joymax 250 Oxygen Sensor, Heated Lambda O2 for Citycom 300 Gts250 Evo Maxsym400

Upgrade your scooter’s emissions control with the Joymax 250 Oxygen Sensor, a heated Lambda O2 sensor designed for seamless compatibility with JOYMAX250, CITYCOM300, GTS250 EVO, and MAXSYM400 models. Built by IWOKPHD, this sensor delivers precise steering of the air-fuel ratio, helping your engine run cleaner, smoother, and more efficiently. The heated design ensures fast warm-up and stable readings in all conditions, so you experience reliable performance from cold starts to highway cruising.

Benefits & Tips

• Improved fuel efficiency: a stable oxygen reading helps the ECU adjust fuel delivery accurately, reducing wasteful fuel consumption.
• Smoothed idle and throttle response: precise lambda readings translate to steadier idle and crisper acceleration.
• Reliable performance in cold weather: the heating element reaches operating temperature quickly for accurate sensing even in cooler environments.

Product specifications

• Brand: IWOKPHD
• Model/Name: Joymax 250 Oxygen Sensor, Heated Lambda O2
• Sensor Type: Piezoelectric
• Type: Heating Type
• OEM No. / Part Numbers: 37890-A5L-000, 37890A5L000, 37890 A5L 000
• Compatibility: For JOYMAX250, CITYCOM300, GTS250 EVO, MAXSYM400
• Origin: Mainland China
• Package: 1 piece
• Warranty: 2 years (Replacement Warranty)

All electronic and mechanical equipment, devices and machines sold by InterCyprus to EU countries are CE certified and carry a two year warranty.

Package includes:

• 1 x Oxygen Sensor

Warnings/Reminders

• Please check the part number carefully to ensure you’ve chosen the correct component for your vehicle: 37890-A5L-000, 37890A5L000, or 37890 A5L 000.
• If you’re unsure which item fits your scooter, send the Part Number or the original product photos to confirm before ordering. We typically reply within 24 hours (excluding weekends and holidays).
• The only way to be 100% sure the part will fit your vehicle is to compare with your original part; we will verify fitment upon request.

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