The BMW Part Number Structure
Every genuine BMW part carries a structured part number that encodes information about the component system and its revision history. Understanding this structure helps you verify that you have the right part and identify superseded or updated versions.
Breaking Down a BMW Part Number
Example: 11 12 7 837 293
- 11 — Main group code (engine)
- 12 — Sub-group (cylinder head / valvetrain)
- 7 — Series identifier within the sub-group
- 837 293 — Sequential part number
BMW Main Group Codes
- 11 — Engine
- 12 — Engine electrical (sensors, ignition)
- 13 — Fuel and exhaust
- 17 — Cooling system
- 18 — Exhaust system
- 21 — Clutch
- 23 — Manual gearbox
- 24 — Automatic gearbox
- 31 — Front axle / suspension
- 32 — Steering
- 33 — Rear axle / suspension
- 34 — Brakes
- 41 — Body / structure
- 51 — Doors and body panels
- 61 — Wiring and electrical
- 63 — Lighting
- 64 — Heating and air conditioning
- 71 — Seats
How Supersession Works
BMW regularly updates parts — when a component is revised (improved material, updated design, new supplier), the old part number is superseded by a new one. The old number remains in the system linked to the new number, so a dealer or OEM parts supplier can trace the current active part number from any historical number. If a part number returns no result in our search, it has likely been superseded — contact us or check realoem.com for the current number.
Searching Without Spaces
BMW part numbers are stored in databases without spaces: the number above becomes 11127837293. Our search accepts both formats — with or without spaces and dashes. Search BMW parts here.