What does code P1401 mean on BMW vehicles?
The ECU detects excessive current flow to the heated catalytic converter on Bank 1 during heating operation.
OBD-II Code BMW
P1401 — BMW — Heated Catalyst Current Too High During Heating (Bank 1)
The ECU detects excessive current flow to the heated catalytic converter on Bank 1 during heating operation.
Common symptoms
- Check engine light illuminated
Possible causes
- Short circuit
- wiring damage
- internal heater fault
Initial recommendation
Inspect heated catalyst circuit for shorts and verify current draw.
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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