How a Mercedes part number is built
Mercedes numbers open with a letter — A for a current service part, Q for accessories and consumables, N for standardised fasteners — followed by three digits of model series, three of assembly group, and four identifying the part. In A 205 820 15 01, the 205 is the W205 C-Class and 820 is the electrical and lighting group.
The model-series block is the most useful part to know. W204, W205, W206 are successive C-Class generations, W211 and W212 are E-Class, W463 is the G-Class. A number whose series block does not match your car is a number for a different car, whatever else looks right about it.
N-prefixed numbers are the exception worth remembering: they are standard fasteners shared across the whole range, so a bolt number appearing on a G-Class diagram is genuinely the same bolt as on an A-Class.
SA codes decide what the VIN alone cannot
Mercedes builds to order to an unusual degree, and the consequences reach deep into the parts list: AMG line suspension, air suspension, the distance and lane packages, cold-climate equipment, and half a dozen seat and trim variants all change the components fitted.
Those choices are recorded as SA codes — three-digit Sonderausstattung numbers on the vehicle data card. When the catalog offers two plausible entries for one VIN, the SA code is the tiebreaker. Reading a data card is a skill worth twenty minutes of anyone's time; the guide on Mercedes data cards and SA codes walks through it.
Vans, smart and the commercial split
Sprinter, Vito and Citan sit in the same catalog as the passenger cars, and they carry the same variant density in a different form: wheelbase, roof height, gross weight rating and drive layout all move parts, exactly as they do on a Transit. smart models are catalogued alongside them.
Because commercial vehicles stay in service far longer than cars, the supersession chains on van parts are frequently the longest in the catalog — another reason to read the chain to its end rather than reordering the number on last year's invoice.
Common Mercedes-Benz nameplates
These nameplates help you find the right vehicle family. Confirm the exact model, market and production period against the active catalog before quoting a part:
| Model | Production years |
|---|---|
| Mercedes-Benz C-Class | 2021–present |
| Mercedes-Benz E-Class | 2016–present |
| Mercedes-Benz GLC | 2022–present |
| Mercedes-Benz A-Class | 2018–present |
| Mercedes-Benz Sprinter | 2018–present |
| Mercedes-Benz GLE | — |
| Mercedes-Benz S-Class | — |
Frequently asked questions
What does the A at the start of a Mercedes part number mean?
A marks a current Mercedes-Benz service part. Q is used for accessories and consumables, and N for standardised fasteners shared across the range. The three digits after the prefix are the model series.
What is an SA code?
A Sonderausstattung code: a three-digit number identifying one factory-fitted option on that specific vehicle. SA codes appear on the vehicle data card and decide between catalog entries that a VIN alone leaves ambiguous.
Does the catalog cover Sprinter and Vito?
Yes. Mercedes-Benz vans are in the same catalog as the passenger range, resolved by VIN in the same way, with wheelbase, roof height and weight rating taken from the build.