Tecdoc Motornummer -

If you have chipped or tuned your ECU, do not change the Motornummer. TecDoc is for OEM specifications. Always use the factory engine code as it left the assembly line.

Make:         BMW
Engine code:  M54B22
Engine number: 5 123 456 (hypothetical)
Displacement: 2171 cm³
Power:        125 kW (170 PS)
Fuel:         Petrol
Cylinders:    6 in-line
Firing order: 1-5-3-6-2-4

Two cars with the same VIN prefix (same year, same model) can have a different Motornummer range. For example, the Peugeot DW10 diesel engine underwent a piston ring design change in 2006. Engines with Motornummer below a specific threshold use old rings; above it use new rings. TECDOC knows this; the average eBay seller does not.

Before diving into the engine number, it is crucial to understand the ecosystem. TECDOC, developed by TecAlliance, is the world’s largest and most trusted electronic spare parts catalog. It aggregates data from over 700 brands (including Bosch, ZF, Continental, and Delphi) and structures it so that repair shops can find the exact OEM (Original Equipment Manufacturer) or aftermarket part number in seconds. tecdoc motornummer

TECDOC organizes vehicles by:

The hierarchy is strict. You cannot reliably reach the last level—the specific part—without accurate engine data. If you have chipped or tuned your ECU,

Report ID: TD-MOTO-2024-001
Date: [Current Date]
Author: Automotive Data Standards Division
Subject: Function, Structure, and Application of Engine Numbers in TecDoc

Many parts sellers rely solely on the Vehicle Identification Number (VIN). While the VIN contains the engine code, it does not contain the sequential engine serial number (Motornummer). This leads to three common problems: Two cars with the same VIN prefix (same

| Step | Action | TECDoc Response | |------|--------|----------------| | 1 | Input VIN WBA3A5... | Model: BMW 320i (E90), Year: 2007 | | 2 | System asks: "Which engine?" | Shows N46B20, N43B20, M47D20... | | 3 | Input Motornummer: N43B20A 98765432 | Confirms: Engine code N43B20A (Valvetronic, petrol, 125kW) | | 4 | Select part: "Timing chain kit" | System checks: Engine serial above N43B20A 500000 → Use updated chain tensioner part # 11 31 7 607 123 |