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Stop riding on a flat tyre. Read the size and construction on the tyre sidewall and note whether the affected wheel is front or rear. Photograph the valve and damaged area. A tyre, tube, valve or rim issue may be involved; the right replacement depends on the wheel and model.

Do not ride with unreliable brakes. With the vehicle off, look for visible damage, contamination or a lever that does not return freely. Note which brake is affected and photograph the caliper and existing pads. Have the fault assessed before ordering pads, levers, cables or a caliper.

Record the charger indicator and any display or app message. Compare the charger label with the vehicle manual; voltage, polarity and connector must all match. If there is heat, swelling, damage or suspected water ingress, stop using and charging it. A battery is not automatically the cause. Arrange diagnostics before buying electrical parts.

Check the exact starting procedure in your model manual and whether an app lock or displayed warning is active. While switched off, see whether the throttle returns freely. Do not bypass brake cut-offs or test a faulty throttle by riding. Persistent faults need the control, wiring and related systems assessed.

Photograph the code exactly, including letters and leading zeros. Note the model, display version and whether the issue followed rain, impact or a recent repair. Inspect only accessible exterior areas with power off. Do not unplug live connectors. A display, loom or controller may require professional testing.

Stop riding if the steering, folding joint, fork or frame feels loose or damaged. Photograph the affected area without dismantling it. A technician should assess structural and steering faults. Cosmetic mudguard parts still need the exact model, mounting pattern and any integrated light wiring checked.

A code points to a system or signal that needs checking. Wiring, connections or more than one component may produce the same warning. Confirm the cause and exact fitment before ordering.

For an ordered-part repair, wait until the correct part reaches your address. Then book the agreed fitting service and bring your vehicle, part and order number. You can arrange a diagnostic assessment before buying parts.

The selector includes additional NIU, Xiaomi and Segway Ninebot models alongside our current vehicle catalogue. If yours is missing, enter it manually for an assessment. Parts and service availability must be confirmed for each vehicle.