BMW fault code 4040
Engine electronics
In the engine electronics, code 4040 means different things depending on the version of the module in the car. Find your car below; the app shows the right one for yours.
4040 DFP for SRC error of Tank 1 (nv)
Module versions: Digital Diesel Electronics (D50M47A), Digital Diesel Electronics (D50M57A0), Digital Diesel Electronics (D50M57C0), Diesel electronics master (D51MM670)
In: 3 Series (E46) 1998–2006
4040 (0) DFP for SRC error of Tank 1 (nv)
Module version: Digital Diesel Electronics (DDE50K47)
In: 3 Series (E46) 1998–2006, X5 (E53) 1999–2006, Z8 (E52) 2000–2003
Reading and clearing it
Fault code 4040 is a BMW code, stored in the car's engine electronics, not a generic OBD2 code (P0xxx): a generic OBD2 reader only reaches the engine's emissions faults, so it won't show it. AutoLingo for BMW reads it with BMW's own diagnostic protocols, in plain English, with the details the module stored about it, and clears it after a repair. If a fault comes right back after it's cleared, the problem is still there.
The engine electronics is on: 3 Series (E46), Z8 (E52), X5 (E53), 5 Series (E60), 5 Series (E61), 6 Series (E63), 6 Series (E64), 7 Series (E65), 7 Series (E66), 7 Series (E67), X5 (E70), X6 (E71), X6 (E72), 1 Series (E81), 1 Series (E82), X3 (E83), X1 (E84), Z4 (E85), Z4 (E86), 1 Series (E87), 1 Series (E88), Z4 (E89), 3 Series (E90), 3 Series (E91), 3 Series (E92), 3 Series (E93)
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