What does code P1402 mean on BMW vehicles?
The ECU detects an overtemperature condition in the power switch controlling the heated catalytic converter on Bank 1 and activates protection mode.
OBD-II Code BMW
P1402 — BMW — Heated Catalyst Power Switch Overtemperature Condition (Bank 1)
The ECU detects an overtemperature condition in the power switch controlling the heated catalytic converter on Bank 1 and activates protection mode.
Common symptoms
- Limp mode activation
- reduced engine performance
Possible causes
- Thermal failure in heated catalyst system
- excessive current draw
- internal heater fault
Initial recommendation
Inspect heated catalyst system, power switch, and related wiring for overheating issues.
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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