In Italy a change to engine software that alters power or emissions compared with the approval data falls under modifications to the vehicle’s construction characteristics (Article 78 of the Highway Code). For a remap on a production vehicle, however, there is no procedure in Italy that allows it to be recorded on the registration document. Disabling DPF, EGR and AdBlue on road vehicles is never allowed.
What the rules say
The Highway Code covers any modification that affects a vehicle’s construction and functional characteristics: if power, emissions or noise change compared with what is stated in the registration document, the figure on the document no longer matches the vehicle.
Here is the point most sources get wrong. For an engine software remap on a production vehicle there is no procedure in Italy to update the registration document: the Motorisation office has no test that can certify it, because that would require documentation from the manufacturer or an approved body covering the modified configuration, and for aftermarket work that documentation does not exist. It is not a slow or expensive procedure — it is a procedure that cannot be done.
The practical consequence is that a remapped vehicle cannot be brought back into conformity with its own document, and this weighs on insurance, roadworthiness testing and use on public roads. That is why we always keep the original file: returning to stock is the route that remains. For track use the picture is different.
What changes in practice
| Aspect | What happens |
|---|---|
| Registration document | There is no procedure to update it after a remap: the figure on the document stays the original one |
| Insurance | An undeclared modification can lead to the insurer seeking recourse after an accident |
| Manufacturer warranty | The manufacturer may refuse work on components linked to engine and transmission if it detects the modification |
| Inspection | Emissions must stay within limits; no emission control device may be altered |
What is never allowed on the road
Removing or disabling the DPF, EGR and AdBlue/SCR is not permitted on vehicles driven on the road. It concerns only competition, off-road or export vehicles. On the road, when these components give trouble, the solution is to clean, repair or replace them with approved parts: see the guides on DPF/FAP, EGR and AdBlue.
What MasterTuning does
Before the work we explain what it means in your case (registration document, insurance, warranty) and we save the original file, so returning to stock is always possible. On a vehicle still under warranty we recommend assessing it with us before proceeding.
Questions to ask before remapping
- Is the original file saved and can I have the stock state back?
- Is the file developed on my vehicle or is it generic?
- What does it mean for the registration document, given that it cannot be updated?
- What does it mean for insurance and warranty?
General information, not a substitute for advice from a qualified professional for your specific case.
How MasterTuning helps
We read the real values of the control unit, not just the code: that is the difference between finding the faulty component and replacing parts by trial and error. After the repair we clear the error and check that it does not come back. Find the nearest centre or contact us.
Have questions about your case? Book a diagnosis at the nearest MasterTuning centre.
Frequently asked questions
Is remapping legal in Italy?
A change that alters power or emissions compared with approval falls under Article 78 of the Highway Code. For a remap on a production vehicle, however, there is no procedure in Italy to update the registration document: the vehicle cannot be brought back into conformity with its own document, and this weighs on insurance, roadworthiness testing and use on public roads.
Does remapping void the warranty?
The manufacturer may refuse work on components linked to engine and transmission if it detects the modification. Once the warranty has expired the issue does not arise.
What happens with insurance?
An undeclared modification can lead to the insurer seeking recourse after an accident: it is a point to clear up beforehand.
Can the DPF be removed or the EGR disabled?
No, not on road vehicles. Only for competition, off-road or export.
Can I return to the original software?
Yes, if the original file is saved before the work.