You know the price before any work starts, you can follow every stage, and every ECU is tested on the bench before it leaves us.
An ECU (engine control unit) is the computer that runs your engine. You post or bring us the unit itself, and we send it back finished and tested. Where a price is shown, it's fixed — you see the total before you pay.
Engine won't start, warning lights on, the ECU won't communicate, or water has got into it? Every fault is different, so repairs are priced case by case. Tell us what's happening and we'll reply with a price before any work starts.
When your own ECU has failed, or you are fitting a second-hand one.
Your ECU is faulty and you have a replacement? We copy everything from the old unit to the new one — software, immobiliser data and settings. The replacement then works in your car just like the original.
A used or replacement ECU often won't start the engine, because it doesn't recognise your keys. We switch off the immobiliser check inside the ECU, so the engine starts.
The same job for BMW and MINI cars with the EWS immobiliser.
Every ECU stores a VIN — the vehicle identification number. When you fit a used ECU, we write your own car's VIN into it, so it matches your car.
Changes to how the engine runs.
We adjust the engine software for more power, more torque and a quicker response when you press the accelerator.
Sets a top-speed limit — or raises or removes one that is already set.
Raises or lowers the rev limit — the highest engine speed (RPM) the engine is allowed to reach.
Puts the original factory software back — for example before selling the car, or to undo earlier tuning.
When a part has failed or been removed, the ECU keeps looking for it and shows errors. We switch that check off.
One fault code (DTC) keeps coming back? We switch off that one code, so it stops turning on the warning light. All other fault codes keep working as normal.
The engine no longer switches itself off every time you stop — no need to press the button after every start.
On diesel engines, we switch off the throttle valve (TVA) control, so a faulty or removed valve no longer causes errors or a loss of power.
The swirl flaps inside the intake manifold can wear out and break. Once they have been removed or blocked off, we switch off their control, so no errors appear.
For off-road, motorsport or export vehicles only. Removing or switching off emissions equipment is not legal on vehicles used on public roads in the EU, and such a vehicle can fail its technical inspection. You are responsible for how the vehicle is used.
The diesel particulate filter (DPF) catches soot from the exhaust. Where the filter has been removed, we switch off its control in the software.
The exhaust gas recirculation (EGR) valve sends some exhaust gas back into the engine. Where the valve has been removed or blocked off, we switch it off in the software.
The AdBlue (SCR) system cuts NOx emissions on diesel engines. We switch it off in the software, so there are no AdBlue warnings and no countdown to a no-start.
Where the catalytic converter has been removed, we switch off the rear oxygen (lambda) sensor, so it doesn't cause errors.
All prices include VAT.
Tested ECUs in stock, ready to fit. Each listing is one real unit, with its own part number, condition and photos. Can't see the one you need? Ask us and we'll find it.
See ECUs in stock →Buy a checked ECU software file and download it straight away. You can also keep your own files safe in your account, or offer them for sale — we check every file before it goes on sale.
Browse ECU files →Two minutes: your unit, what it's doing, photos if you have them. You see the price before you pay.
Print the prepaid DPD or Omniva label we email you, or drop the unit off in Ventspils.
Bench diagnosis, repair or reflash, then tested. You get an email at every stage change.
Returned tracked, with the tracking number in your account and a backup of your original file kept.
Not sure whether we can fix your unit, or what it would cost? Describe it and we will tell you honestly — including when the answer is no.