Vehicle Modification: Change of Technical Characteristics

⚠️ Important: Any change in technical characteristics must be declared mandatorily. Driving with a registration certificate that does not match the actual characteristics of the vehicle is punishable by law.

Vehicle modification allows you to report a change in your vehicle's situation and update your registration certificate accordingly.

This process allows for:

• The technical modification of the vehicle (type, power, fuel, etc.)
• The modification of an entry or use (collector, agricultural, military, driving school, ambulance, administration...)
• The withdrawal or re-entry into circulation of the vehicle
• The declaration of plate usurpation
• The declaration of a dangerous or scrap vehicle

✅ Frequent modifications:

• Installation of an ethanol kit: Fuel change (petrol → petrol/E85)
• Electric conversion: Conversion from internal combustion to electric engine
• Engine change: Engine replacement
• Power modification: Increase or decrease in fiscal power
• Type change: Passenger vehicle → Commercial vehicle, or vice versa
• Change of use: Conversion to collector, agricultural, driving school, etc.

✅ Mandatory documents:

• Registration certificate (current vehicle registration)
• Valid proof of identity
• Proof of address less than 6 months old
• Certificate of conformity or individual approval (RTI) for the modification
• Invoice for the modification (garage, approved installer)
• Homologation report (if applicable)

✅ Good news: No need for a confidential code or transfer code for this process.

📨 Registration certificate received within 1 to 3 weeks

Processing time varies depending on:

• The complexity of the modification
• The time of year
• The completeness of your application

Provisional certificate: You receive a CPI (Provisional Registration Certificate) which allows you to drive while waiting for the new registration certificate.

Option 1: On the ANTS website

You can complete the process yourself on ants.gouv.fr. The procedure is 100% online with electronic signature of Cerfa documents.

Option 2: Via an authorized professional

An expert checks your application, fills out the forms, and manages the entire procedure. Zero risk of error, guaranteed time saving.

Note: The modification service by our experts is paid and includes personalized support.

• Not declaring the modification: Driving with a non-compliant registration certificate is illegal
• Non-approved modification: Some modifications require prior approval
• Forgetting the certificate of conformity: Essential to validate the modification
• Incomplete documents: Missing modification invoice, homologation report
• Not passing the technical inspection: Mandatory after certain significant modifications

🎯 Entrust Us With Your Vehicle Modification

Our team of experts manages your registration certificate modification from A to Z. 100% online procedure, electronic signature, free support.

• ✅ Verification of your modification documents
• ✅ Electronic signature of Cerfa forms
• ✅ 100% online process
• ✅ Registration certificate received within 1 to 3 weeks
• ✅ Free customer support (email/phone)
• ✅ Personalized assistance 7/7

Which modifications require a change to the registration certificate?

All technical characteristic modifications: type, power, fuel, engine, use (collector, agricultural, etc.), derestriction, electric conversion, ethanol kit, etc.

Do I need the confidential code for a modification?

No. No confidential code or transfer code is needed for this process.

How long does it take to receive my new registration certificate?

Processing time is 1 to 3 weeks depending on the complexity of the modification and the time of year.

Can I drive while my application is being processed?

Yes. You will receive a provisional registration certificate (CPI) which allows you to drive while waiting for your new registration certificate.

Are all modifications allowed?

No. Some modifications require prior approval and a technical inspection. Check with a professional before making the modification.

What happens if I don't declare my modification?

You will be driving with a non-compliant registration certificate, which is illegal. You risk a fine and problems with your insurance in case of an accident.

How much does a registration certificate modification cost?

The cost depends on the nature of the modification. Some modifications lead to a change in fiscal power and thus regional tax. Others are free (simple change of use).