Here’s a step-by-step guide on replacing the spring wire (display-to-controller cable) in an E-twow scooter (the cable that runs inside the main stem/tube). This will help you do it safely and correctly. If you want, I can also give you photos or a printable version.
This is the part you need to replace usually if your scooter shows E2 error.
What you need / what it is
The spring wire is the flexible multi-wire cable (often “coiled” or “spring” shaped) that connects the display at the top of the handlebar stem/tube to the controller down below. It often passes through the folding hinge and the main bar/tube.
It carries display signals, and sometimes power, so when it's damaged or broken internally, you may get display issues, no speed reading, no control, etc.
Tools & materials you might need
Replacement spring wire compatible with your model.
Basic screwdriver set (Phillips, flathead)
Allen/hex keys (for bolts in the hinge, stem, maybe display clamp)
Pliers or wire cutters (just in case)
Electrical tape / heat shrink (if you need to secure or protect connections)
Possibly a thin lubricant (for easier feeding inside the stem)
Clean workspace, maybe a tray for screws, parts
Safety first
Turn off the scooter completely, remove battery power if possible.
Work in a clean, well-lit area.
Keep track of small parts (screws, grommets, cable clips).
Be gentle — internal wires are delicate, especially at bends.
Step-by-step replacement
Below is the typical process. The exact order/details might vary depending on your E-twow model (Booster, GT, etc.), so it helps to refer to your model’s service manual or watch a video while doing it.
1. Open the top: remove display & controls
Remove screws/clamp holding the display or display bracket on top of the stem. Usually a few small bolts.
Detach any connectors carefully (display plug, button pad, etc.).
If there's a cover or rubber grommet through which the cable enters the stem, gently remove that.
2. Disassemble folding hinge or stem top clamp (if needed)
Many E-twow scooters have a folding mechanism at the bottom of the handlebar stem/hub. The cable often goes through that hinge, so you will need to loosen or remove parts of the hinge to allow passage of cable.
Be careful to note how the hinge parts go together. Sometimes there are washers, spacers, bushings. Keep track.
3. Remove old spring wire
Pull the old cable out from the display end first, feeding it down through the stem, through hinges, etc.
If there are clips, cable guides, or plastic inserts inside the stem, remove them so the cable can slide freely.
Be gentle; often the wire will be tight or stuck, especially where bends happen. Use lubrication or gentle wiggling, but don’t force sharply.
4. Prepare and inspect
Inspect the inside of the stem, hinges, entry points for damage, sharp edges, or places that may rub the new cable.
Clean out any dirt, rust, or debris.
If there are protective grommets or sleeves, check them; replace if damaged.
5. Install the new spring wire
Start from the display end: connect the display plug to the new wire (if applicable) or position the display near its mount.
Feed the wire down through the stem, keeping it aligned, non-twisted, not snagging.
Through hinge(s), using the same route as the old wire.
Make sure there's enough slack so that folding or steering movement does not pull or pinch the wire.
6. Secure & re-assemble
Replace any cable guides, clips, or inserts inside the stem.
Reassemble hinge or folding mechanism: tighten bolts to spec, ensure smooth folding.
Re-mount display, tighten screws, ensure the display is aligned and doesn’t rub on anything.
If needed, wrap or protect the exposed sections (for example near the display or hinge) with tape or shrink wrap.
7. Test
Before putting everything back together fully, turn on the scooter and test the display, throttle, brakes, speed reading, etc. Wiggle the handlebars and folding hinge to see if anything changes.
Make sure that folding/unfolding doesn’t cause glitches or display loss.
If all good, finish tightening everything and ensure no cable chafing.
Common pitfalls and tips
Too tight a bend: The cable can break inside insulation at sharp bends. Always leave gentle curves.
Pinching or rubbing: Edges inside the stem or hinge can wear the cable over time. Smooth them if needed or use protective tubing.
Insufficient slack: Folding or steering motion needs slack so the wire is not under tension.
Wrong connector type: Some models (GT vs Booster etc.) use different plugs or number of wires. Make sure your replacement matches.
Water ingress: If seals or grommets are compromised, water can corrode connections. Use good sealing and ensure waterproofing as per model design.
Where to get the replacement: https://www.alussion-link.com/collections/cables-1
Make sure you order the correct voltage (36V / 48V etc.), correct connector style, and correct model compatibility.