Frequently Asked Questions

Bench diagnostics are usually done within 24 to 48h of receiving the ECU. The repair itself depends on the fault found — we'll give you an accurate timeline with your quote.

Yes. If you're not in the Paris region, you can send us your ECU by parcel. Request this through the contact form to get the shipping address and instructions.

This involves a full reprogramming of the access system. We'll ask for ID and proof you're entitled to use the vehicle (registration document) before any work starts, as an anti-theft measure.

Often, yes, for key-related jobs (lost, stolen, broken): car insurance, home insurance, or even certain bank cards. We provide a detailed invoice that meets insurers' requirements. See our dedicated insurance page for details.

We travel on-site within the Île-de-France region. Outside that area, postal shipping (of the ECU or the key/electronic module) is available for most of our services.

Our price list is still being finalised. Every quote is tailored to your vehicle and the fault involved — contact us for a free quote within 24h.

Contact us directly by phone or WhatsApp rather than through the form — our contact details are highlighted on the ECU and Keys pages for exactly this kind of situation.

The most frequent causes are voltage spikes (a badly connected battery, a faulty alternator), moisture or corroded connectors, and ageing electronic components (capacitors, solder joints). Most of these faults can be repaired without replacing the whole ECU. See our dedicated blog article for details.

Yes, it's one of the most common causes: water ingress or even ambient humidity can corrode circuit board tracks or connectors, causing short circuits or intermittent bad contacts.

Yes, if the battery is disconnected or reconnected carelessly (reversed polarity, disconnecting under load), a voltage spike can damage the ECU's electronic components. We recommend turning off the ignition and following the correct connection order.

Every ECU is bench-tested before and after repair to confirm it works correctly under real conditions, not just visually. A full replacement is only suggested when repair is no longer a reliable option.

You already have one working key and simply want an extra one (for a second driver, a spare...) without losing what you already have. We program a brand-new key directly on the vehicle (via its ECU) so it recognises it, while keeping all your current keys active. You don't need to bring in an existing key to copy from.

If every key for your car is lost, stolen or broken, the vehicle's entire access system needs to be reprogrammed: the old keys are invalidated (in case someone else finds them) and one or more new keys are registered instead. This is the most involved procedure. For anti-theft reasons, we always require proof of ID and proof that you're entitled to use the vehicle before starting.

Duplication means copying a key you already own and that still works (its transponder, its remote) onto a blank key, to get an identical copy — so you need to bring us the original key to copy from. Adding a key is different: it's programmed directly on the vehicle without needing an existing key in hand.

The immobiliser is the system that checks a key actually matches the vehicle before allowing it to start. When an ECU is repaired, cloned or replaced, the link between your keys and the new ECU has to be re-established so your existing keys keep working normally. This is a technical step that follows ECU work — it has nothing to do with lost keys or spares.

Bench testing means running your ECU outside the car, in a controlled setup, to check it precisely without interference from the rest of the vehicle (a bad ground, damaged wiring, etc.). It's what lets us confirm with certainty that the fault really is the ECU before charging for a repair — so you're not billed for work that wouldn't actually fix the problem.

Cloning means copying all the data from one ECU (programming, mileage, security codes...) onto another one, identically. It's useful when your original ECU can't be repaired: we transfer its data onto a replacement ECU (new or used) so it works exactly like the original, without you having to go through a full re-registration process at a dealership.

Instead of replacing the whole ECU, we identify and replace only the faulty electronic parts inside it (power transistors, voltage regulators, connectors...) directly on the circuit board. It's a targeted repair — faster and considerably cheaper than a full replacement, whenever the ECU's condition allows it.

Once repaired, we reprogram and code the ECU if needed, then bench-test it again to confirm it works correctly under real conditions before handing it back. You get an ECU that's ready to be refitted straight onto your vehicle, with nothing further to adjust on our end.

Yes — within Île-de-France, we can come directly to your home or wherever your car is, remove the ECU, take it away for diagnosis and repair, then come back to refit it once it's fixed. In most cases you don't need to remove the part yourself or have the car towed.

You can send us your ECU by parcel from anywhere in France. Request this through our contact form: we'll give you the shipping address and packaging instructions, then send the repaired ECU back to you once the work is done.