What does code P1456 mean on BMW vehicles?
The ECU detects an open circuit in the power supply for the heated catalytic converter heater on Bank 1.
OBD-II Code BMW
P1456 — BMW — Heated Catalyst Heater Power Supply Open Circuit (Bank 1)
The ECU detects an open circuit in the power supply for the heated catalytic converter heater on Bank 1.
Common symptoms
- Reduced catalytic efficiency
- emissions increase
Possible causes
- Open circuit in power supply
- wiring damage
Initial recommendation
Inspect heater power supply wiring and restore proper electrical connection.
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.
Analyze this code with MecaOBD
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