BMW DTC P1456 – Heated Catalyst Heater Power Supply Open Circuit (Bank 1)
DTC P1456 meaning on BMW
The Diagnostic Trouble Code (DTC) P1456 on a BMW indicates an open circuit in the power supply for the heated catalyst heater in Bank 1. This fault code is specific to the heating element in the catalytic converter system of the vehicle.
BMW DTC P1456 symptoms
Symptoms of DTC P1456 on a BMW may include:
- Check Engine Light (MIL) illuminated on the dashboard
- Reduced engine performance or power
- Increased emissions
BMW DTC P1456 causes
The common causes of DTC P1456 on a BMW include:
- Faulty heated catalyst heater
- Open circuit in the power supply to the heater
- Wiring or connector issues
BMW DTC P1456 seriousness
DTC P1456 should not be ignored as it can lead to increased emissions, reduced fuel efficiency, and potential damage to the catalytic converter. It is important to address this issue promptly to maintain the vehicle’s performance and comply with emissions regulations.
How to diagnose DTC P1456 on BMW
To diagnose DTC P1456 on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the wiring and connectors related to the heated catalyst heater
- Test the resistance of the heater element to determine if it is faulty
How to fix DTC P1456 on BMW
To fix DTC P1456 on a BMW, the following steps may be taken:
- Replace the faulty heated catalyst heater
- Repair any open circuits in the power supply to the heater
- Address any wiring or connector issues
How to erase DTC P1456 on BMW
To erase DTC P1456 on a BMW, the fault code can be cleared using a diagnostic scanner. After the repair has been completed, the code can be cleared to reset the Check Engine Light and ensure that the issue has been resolved.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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