What does code P1405 mean on BMW vehicles?
The ECU detects an overtemperature condition in the heated catalyst power switch on Bank 2 and enters protection mode.
OBD-II Code BMW
P1405 — BMW — Heated Catalyst Power Switch Overtemperature Condition (Bank 2)
The ECU detects an overtemperature condition in the heated catalyst power switch on Bank 2 and enters protection mode.
Common symptoms
- Limp mode
- reduced engine output
Possible causes
- Thermal failure
- excessive electrical load
- heater control fault
Initial recommendation
Perform full diagnostic of heated catalyst system on Bank 2.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
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