Region Conversion

A region conversion recodes an imported Mercedes so it matches the cars sold in the country you're driving it in. On a car brought in from the US, Japan, China, or the Gulf, the speedometer sits in MPH and the headlights fail inspection. Ambient lighting is missing zones, MBUX won't take your language, and the navigation map covers the wrong continent, all of it set by the region the car was built for.

Coding does most of the job. Navigation also needs a map license tied to your VIN, and some chassis need physical part swaps on top. Send the VIN and we'll tell you up front which parts, if any, your car needs.

What gets converted

A conversion covers some or all of the items below. Which ones apply depends on the direction you're going (US → EU, EU → US, JP → EU, CN → EU, GCC → EU).

• Instrument cluster units (MPH ↔ KPH, °F ↔ °C, gallons ↔ liters)
• Speedometer primary scale
• Headlight beam pattern (EU asymmetric ↔ US SAE)
• Daytime running lights (DRL)
• Side marker lights and reflectors
• Turn signal color and flash rate
• Rear fog lamp
• MBUX language packs and keyboard
• Navigation map region
• Radio bands (HD Radio, DAB+, and SiriusXM)
• Tire pressure monitoring (TPMS) threshold and units
• eCall (emergency call)
• Clock format and date format
• Tire sizing and consumption display
• Cluster badging

US → EU (the most common job)

This is the conversion we run most. A US car coming into Europe gets:

• Cluster units to metric, KPH primary
• Headlight beam to EU asymmetric
• Side markers off
• Rear fog enabled
• Turn-signal colors corrected
• DRL to EU behavior
• MBUX language packs, keyboard, and voice locales
• Navigation map swapped from NAR (North America region) to EU. Generate the map license here
• HD Radio off, DAB+ on
• eCall where hardware present

Newer cars (W206, W223, X254, EQE, EQS) need SECoC commissioning, which we handle.

EU → US or Canada

Sending a European car to the US or Canada reverses most of the same items:

• Cluster to imperial, MPH primary
• Headlight beam to SAE
• Side markers and DRL to the US pattern
• Nav map to NAR
• HD Radio on, DAB+ off, SiriusXM where supported
• Cluster badging and language defaults

Federal Motor Vehicle Safety Standards (FMVSS) compliance is the owner's or shipper's responsibility. We code the software to factory-US spec. We don't certify the car for the Department of Transportation (DOT).

JP → EU or ROW

A Japanese-market car moving to EU or rest-of-world (ROW) spec covers:

• Cluster speed-limit and map speed units
• EU map region and map license
• Language packs, keyboard, voice locale
• Headlight beam pattern
• DAB+ enable where hardware present
• DSRC and ETC module deactivation

CN → EU or ROW

A China-market car carries a local app and telematics stack that has to come out:

• EU map license and language pack
• Baidu and other China-specific MBUX apps removed
• CN telematics stack deactivated
• Head unit swap where model year requires it

Send the VIN before you plan the job. Some CN chassis convert cleanly, some need a head unit swap.

GCC → EU

Gulf-spec cars converting to EU spec need the shortest list of the five directions on this page:

• DAB+ enable
• EU locale defaults
• Map region swap

Hardware you might still need

Some jobs need parts on top of the coding. We'll tell you which before you commit.

• Headlamp assemblies. On halogen and early xenon cars where the beam pattern isn't a coded parameter.
• Rear fog lamp. If the US-spec bumper skipped the fog housing entirely.
• DAB+ antenna and tuner. On pre-2018 cars that didn't ship with DAB from the factory.
• Telematics swap. Some China-spec cars need an EU telematics control unit (TCU) for eCall and over-the-air updates to work.
• TPMS valves and sensors. Regional frequency differences on a handful of older chassis.

Most imports (2015+) only need coding and map work. The hardware list gets shorter every model year.

What we need from you

To quote a region conversion, send:

• The VIN. We pull the SA codes and tell you exactly what's reachable in coding versus what needs parts.
• The destination market. EU, UK, CH, NO, NA, and so on. Map sets and eCall differ.
• Your preferred languages. For MBUX, voice, and keyboard.
• The map media. Tell us whether you already have it for the target region, or need us to source it.
• Any inspection coming up. If the car is due for MOT, TÜV, control technique, ITV, RDW, and so on, say so. Some items are inspection-blockers and we'll prioritize those.

Map region changes in detail

The navigation map is its own transaction, separate from coding.

1. We identify your NTG / MBUX generation and confirm the required map version.
2. You buy the correct region disc, USB, or SD card (EU map, NAR map, JP map, and so on).
3. We generate the map license tied to your VIN via the map code flow. This works on NTG4, NTG4.5, NTG4.7, NTG5, NTG5.5, NTG6, NTG7 / MBUX Gen 2 where Mercedes still publishes map updates.
4. Coding switches the head unit's active map region so the correct hemisphere loads on boot.
5. On MBUX Gen 2 (NTG7 / Zero-Layer) the head unit re-downloads the address database and rebuilds the search index on first boot after the swap.

If you already have the media, the whole map region change is a single session. If you need the media as well as the license and the coding, we handle all of it.

How a session runs

• Remote for everything that's coding, map, and language. Your Windows laptop, our bench, an ENET cable on your side. The VCI guide walks through the cable pick.
• Workshop partner when the job needs hardware swaps. We line up a shop near you for the mechanical side and run the coding remotely into their laptop.
• On-site for partner workshops in our region, by appointment.

A typical conversion is 2 to 4 hours of active session time, spread across one or two sittings. Map downloads on Gen20x cars add standalone time but don't need us on the line.

FAQ

Is this legal?

Coding side, yes. We write factory variants your chassis supports, nothing custom. Hardware side is your importer's job (FMVSS, EU type approval, national homologation). We don't sign off on road-legality. We make the car match the destination market's factory spec.

Will it break OTA updates?

No. Once the region is set, Mercedes' OTA pipeline sees the car as native to its new market and pushes the matching firmware.

Will my US warranty stay valid?

No. On in-warranty imports, Mercedes USA won't honor claims on a car coded to EU spec, and the same applies in the other direction. Dealers can re-flash the region if needed. In most cases the warranty already ended when the car was exported.

Can I convert back later?

Yes, every direction is reversible in coding. Map licenses are tied to the VIN, so the target map stays usable. Hardware that was swapped stays swapped until you put the original parts back.

Does this work on a W204, W221, or pre-2011 car?

Often yes, with caveats. NTG2 and NTG3 maps are harder to source, and some units stopped getting licenses years ago. Send the VIN and we'll check.

Pricing

Region conversion pricing is VIN-specific. The SA codes, target market, map license, and whether any hardware has to ship all move the number. We don't publish a flat rate because we've seen the same model year need anywhere from a 90-minute session to a full day plus parts.

Contact us for a quote with your VIN and destination market. The quote comes back with:

• A line-by-line list of what's converting (coding, map, hardware).
• A fixed price for the coding and map side.
• A separate parts estimate if anything mechanical is involved.
• Expected session time.

No charge to scope the job, and no charge if the conversion isn't feasible on your VIN.

Related guides

• Vehicle coding overview. Pricing bands and DIY versus remote.
• VCI / OBD cable picker. Which interface your chassis needs.
• Star3 SECoC coding. SECoC commissioning and ZenZefi certificates on Gen20x cars.
• Remote diagnosis. If the import is throwing faults, start here.
• Map code generator. Generate the license for the new map region.
• Coding landing page. Real footage of what ships on the cars we touch.

Contact

Email contact@mbretrofit.it with subject line Region conversion request and include your VIN and destination market. We reply the same working day.