Alfa Romeo RZ VIN Decoder

Decode an Alfa Romeo RZ chassis number and get what can honestly be confirmed about the car behind it: manufacturer, general build origin, and how the number itself is structured. Type it into the decoder at the top of this page for an instant read, and see below for why the RZ is a genuinely unusual case among the cars covered on this site.

The RZ, short for Roadster Zagato, is a tiny-volume open-top sports car sold only in Europe from 1992 to 1994 and never offered new in the United States. It is the convertible half of a pair. Zagato, the Milan-area coachbuilder, designed and built a fixed-roof coupe called the SZ (Sprint Zagato) starting in 1989, using the running gear and rear-transaxle chassis of the Alfa Romeo 75 (sold in North America as the Milano). Three years later Zagato followed it with the RZ, an open-top version with different, more angular body panels (Alfa’s own marketing claimed over 400 exterior differences from the SZ) but essentially the same 75-derived platform and 3.0-liter Busso V6 underneath. Both cars were designed and physically assembled by Zagato itself, at its own Terrazzano di Rho works near Milan, not on an Alfa Romeo production line. That fact, an automaker outsourcing an entire model’s construction to an outside coachbuilder rather than just its styling, is why RZ chassis numbers behave differently from an ordinary Alfa VIN, and it is the first thing to understand before decoding one.

About the Alfa Romeo RZ

Alfa unveiled the RZ at the Paris Motor Show in October 1992, three years after the SZ coupe debuted as the ES-30 concept at Geneva in 1989. Styling is credited to Zagato’s Antonio Castellana working with Robert Opron of Fiat’s Centro Stile, the designer behind the Citroen SM and CX. Underneath the sharply creased composite body, the RZ carries the steel platform, suspension, and rear-mounted transaxle of the Alfa Romeo 75, along with the 75’s 3.0-liter Busso V6, tuned to roughly 210 hp and paired with a five-speed manual gearbox driving the rear wheels.

Production was low even by Zagato’s standards and did not go smoothly. Alfa and Zagato originally planned a run of around 350 cars. Zagato’s own factory went into receivership partway through the build, after roughly 252 cars had been completed, and a further batch was finished under the receivers before the line closed for good in December 1994. Sources differ on the exact final tally as a result: 278 is the figure most commonly cited as the RZ’s official production total, while some auction-house catalog descriptions, including RM Sotheby’s, put the number of cars actually completed at 284. Either way, this is one of the rarest street Alfas ever built, and it was never federalized or sold new through Alfa Romeo’s US dealer network. Any RZ in America today arrived later, generally as a private import once the car cleared the 25-year exemption from US safety and emissions rules.

Spec	Detail
Body style	2-door, 2-seat open-top roadster
Built by	Zagato, Terrazzano di Rho, near Milan
Production years	1992-1994
Units built	278 most commonly cited (some sources report 284 completed)
Platform	Alfa Romeo 75 / Milano steel chassis, rear transaxle
Engine	3.0L (2,959cc) Busso V6, DOHC, 12-valve
Power	Approximately 210 hp (154 kW)
Transmission	5-speed manual, rear-wheel drive
Sister model	Alfa Romeo SZ (Sprint Zagato) coupe, 1989-1991, approximately 1,036 built
Sold new in the US	No

Alfa Romeo RZ WMI and chassis number format

Every VIN decoder on this site starts with the World Manufacturer Identifier, the first three characters of a standard 17-character VIN. For the RZ, we pulled real, catalog-documented chassis numbers from RM Sotheby’s auction listings for three separate cars rather than assume a WMI. All three begin with ZAR, the same WMI Alfa Romeo uses on every other export car covered on this site:

Chassis number	Source	Notes
ZAR16200003002117	RM Sotheby’s, London 2015	Catalog describes this as the 92nd car built, per the numbered plaque on the transmission tunnel; completed 31 March 1993
ZAR16200003002149	RM Sotheby’s, Open Roads (online) 2020	Catalog describes this as the 130th car produced; completed 30 April 1993
ZAR16200003002164	RM Sotheby’s, Monaco 2016	Catalog references this car within the standard 1992-1994 production run

Here is the honest part. These are 17-character strings, but they do not decode as standard ISO 3779 VINs, and we checked rather than assumed. Running two of the three through NHTSA’s vPIC decoder returns real errors on both: the check digit does not calculate correctly, position 10 fails model-year validation, and vPIC cannot resolve several characters at all. It also guesses a plant city of Pomigliano, a real Alfa Romeo factory near Naples that has nothing to do with a car hand-built by Zagato at Terrazzano di Rho, so that value looks like a generic database default and should not be trusted.

What is real and consistent across all three sampled chassis numbers: they share an identical 14-character prefix, ZAR16200003002, built from the WMI ZAR plus the digits 162 (the same internal Alfa Romeo type prefix used on 75/Milano chassis numbers) and a further constant block. Only the final three digits vary: 117, 149, and 164. Notably, those trailing digits do not match the “92nd” and “130th” build-order numbers the auction catalogs quote from each car’s own transmission-tunnel plaque. The plaque number and the chassis number’s trailing digits appear to be two different sequences, not the same one read two ways, and we flag that rather than guess at why.

How to read an RZ chassis number, position by position

This section maps the RZ’s 17-character chassis number onto the standard ISO 3779 position layout used across this site, since that is the framework anyone comparing cars will expect. Treat it as a structural guide, not a working decode: the RZ’s real numbers fail NHTSA’s check-digit and model-year validation, so several positions carry a different kind of information, or none, compared with a compliant modern VIN.
Positions 1-3: WMI. ZAR on every genuine RZ we sampled, matching Alfa Romeo’s standard export WMI (Z for Italy, AR for Alfa Romeo).
Positions 4-8: Vehicle Descriptor Section (VDS). All three real samples read 16200 here, with no variation. That suggests a fixed internal type/model code rather than a field that varies by engine or trim, consistent with the RZ being sold in essentially one specification throughout its run.
Position 9: Check digit. On a compliant modern VIN this character is calculated from the other sixteen using SAE’s modulo-11 formula. NHTSA’s vPIC decoder explicitly flags this position as incorrect on the RZ chassis numbers we tested, so don’t use it to validate an RZ number the way you would on a newer car.
Position 10: Model year. If the RZ followed the standard ISO 3779 30-year cycle used elsewhere on this site, the applicable letters for its production span would be:

Char	Year
N	1992
P	1993
R	1994

I, O, and Q are skipped industry-wide because they can be misread as 1 and 0. That table is the standard reference framework, but it does not describe the real cars: every sampled RZ chassis number carries the digit 0 in this position, which NHTSA’s own decoder confirms is not a valid model-year character. The RZ’s actual model year has to come from the build date on the factory Certificato di Collaudo or auction documentation, not from position 10.
Position 11: Assembly plant. All three sampled chassis numbers carry the digit 3 here. We cannot confirm what, if anything, this was meant to encode, since the RZ never ran on an Alfa Romeo assembly line with a standard plant code; every RZ was built entirely at Zagato’s own Terrazzano di Rho works.
Positions 12-17: Serial number. The one block that meaningfully varies between real cars. Across our three samples it read 002117, 002149, and 002164. These numbers do not line up with the build-order numbers on each car’s transmission-tunnel plaque, so a serial-number match here confirms the correct physical chassis for a specific auction record or title, but should not be read as “the Nth car built.”

Where to find the VIN on an Alfa Romeo RZ

• Stamped into the chassis, typically in the engine bay or trunk floor area, consistent with other European-market 75-platform Alfas of the era
• On a numbered plaque mounted on the central transmission tunnel near the gearlever, showing the car’s individual build sequence, a separate number from the chassis number itself
• On the factory Certificato di Collaudo (certificate of authenticity/completion), when the car still has its original paperwork
• On period Italian libretto or current national registration documents

Because the RZ was hand-assembled in small numbers rather than stamped out on a standard line, paperwork and provenance carry more weight than on a mass-produced car. A missing or inconsistent Certificato di Collaudo is a bigger red flag here than a missing build sheet is on an ordinary sedan.

Recalls and safety information

No major NHTSA recall campaign applies to the RZ, because it was never sold new in the United States and never received a US-compliant VIN or federal safety certification. The more relevant records for an owner or buyer are Stellantis Heritage, which now holds Alfa Romeo’s historical archives, and any documentation Zagato or its receivers issued at the time of construction. Given the RZ’s age and hand-built construction, mechanical condition, transaxle mounts, body attachment points, and the original fuel injection system, matters far more day to day than any recall history. Confirm current state and federal exemption requirements before importing or registering one in the US.

Frequently asked questions

Is the Alfa Romeo RZ the same car as the SZ?
No, though they are closely related. The SZ (Sprint Zagato) is the fixed-roof coupe that came first, built 1989-1991. The RZ (Roadster Zagato) is the open-top version that followed, built 1992-1994. Both share the 75’s platform, transaxle, and Busso V6, and both were designed and built entirely by Zagato, but Alfa’s own marketing claimed over 400 body-panel differences between them, and the SZ is far less rare, with roughly 1,036 built against the RZ’s 278-to-284 total.
Was the Alfa Romeo RZ ever sold new in the United States?
No. It was a European-market car built in tiny numbers and never federalized for US sale. Any RZ in the US today was imported later, typically under the 25-year rule that exempts older vehicles from standard federal safety and emissions requirements.
What does a VIN or chassis number starting with ZAR mean?
ZAR is Alfa Romeo’s standard World Manufacturer Identifier for cars built in Italy for export, confirmed here against real RZ chassis numbers pulled from RM Sotheby’s auction records. It is the same WMI used on the US-market Milano and other export Alfas of the era.
Does the RZ’s chassis number decode like a normal 17-character VIN?
Not reliably. It is 17 characters long, but running real RZ chassis numbers through NHTSA’s vPIC decoder returns explicit errors on the check digit and the model-year position, and NHTSA’s plant-city guess, Pomigliano, does not match where the RZ was actually built. Treat the chassis number as confirming manufacturer and general series, not as a fully standard-compliant VIN.
How many Alfa Romeo RZs were built?
278 is the figure most widely cited as the official total. Some sources, including RM Sotheby’s own catalog descriptions, put the number actually completed at 284, reflecting a run interrupted by Zagato’s receivership and finished afterward by the receivers. Either way, it is a genuinely rare car.
Where is the VIN or chassis number located on an RZ?
Stamped into the chassis near the engine bay or trunk floor, consistent with other 75-platform Alfas of the period. The numbered plaque on the transmission tunnel, which owners and auction catalogs quote as “car number X,” is a separate build-sequence number, not the chassis number itself.
Is this VIN decoder free to use?
Yes. VinDecoderPlus decodes any Alfa Romeo RZ chassis number free, with no sign-up. For a car this rare, expect the decode to confirm manufacturer and structural detail rather than a full factory build sheet; a formal vehicle history report is a separate product with real limits of its own on a European car never sold new in the US.

Decode your Alfa Romeo RZ chassis number

Type your RZ’s chassis number into the decoder above for an instant read. For more background on VIN structure, the RZ’s mechanical donor, and buying an older or imported car generally, these guides go deeper:

• Alfa Romeo VIN decoder hub for every Alfa model covered on this site
• Alfa Romeo 75 VIN decoder for the mechanical platform and Busso V6 the RZ shares with the 75/Milano
• How to read a VIN number for the general ISO 3779 standard
• What every character in a VIN means for a position-by-position reference
• Classic car VIN decoder guide for the extra care older, imported, and low-volume cars like the RZ require
• VIN decoder vs. vehicle history report for what a decode covers and what it doesn’t
• How to check if a car is stolen by VIN for verifying a used RZ before you buy
• How the VIN check digit works for verifying a VIN was not mistyped or altered
• VIN formats by country and manufacturer for what the first three characters tell you