Tools
Diagnostic tools.
Two browser tools for reading BMW fault codes: a lookup that explains what a code’s structure means, and the catalog of BMW-specific codes. Codes are read from your car by the Beemuu desktop app; these pages are for interpreting what you find.
DTC structure & lookup
How OBD-II codes are structured — the P, U, B and C prefixes, the subsystem digits, and what each field tells you before you look anything up.
Open the DTC lookup →
BMW-specific fault codes
The 4-hex-digit codes BMW uses in addition to SAE J2012: 27xx accelerator pedal, 28xx manifold pressure, 29xx fuel rail pressure, 2Axx VANOS, 30xx boost pressure, and the 6-digit B58 codes.
Browse the code catalog →
Reading codes from the vehicle, live data, schematics and service functions all live in the desktop app — these pages work on their own.
Last updated: 2026-09-16 · Beemuu contributors