BMW DTC P14B4 – Exhaust Gas Temperature Sensor Circuit Low (Bank 2, front of Diesel Particulate Filter)
DTC P14B4 meaning on BMW
The DTC P14B4 on a BMW indicates a fault with the Exhaust Gas Temperature (EGT) sensor circuit on Bank 2, located in front of the Diesel Particulate Filter (DPF). This fault specifically points to a low voltage condition in the EGT sensor circuit.
BMW DTC P14B4 symptoms
Symptoms of the DTC P14B4 on a BMW may include:
- Check Engine Light (MIL) illuminated
- Reduced engine performance
- Increased fuel consumption
- Possible regeneration issues with the Diesel Particulate Filter (DPF)
BMW DTC P14B4 causes
Common causes of the DTC P14B4 on a BMW include:
- Defective Exhaust Gas Temperature (EGT) sensor
- Wiring or connector issues in the EGT sensor circuit
- Faulty Engine Control Module (ECM)
BMW DTC P14B4 seriousness
The DTC P14B4 should be addressed promptly as it can lead to reduced engine performance and potential issues with the Diesel Particulate Filter (DPF) regeneration process. Ignoring this fault may result in increased fuel consumption and further damage to engine components.
How to diagnose DTC P14B4 on BMW
To diagnose the DTC P14B4 on a BMW, follow these steps:
- Use a diagnostic scanner to retrieve the fault codes and verify the presence of DTC P14B4.
- Inspect the wiring and connectors in the EGT sensor circuit for any damage or corrosion.
- Test the Exhaust Gas Temperature (EGT) sensor for proper operation using a multimeter.
- Check the Engine Control Module (ECM) for any stored codes related to the EGT sensor circuit.
How to fix DTC P14B4 on BMW
To fix the DTC P14B4 on a BMW, consider the following steps:
- Replace the faulty Exhaust Gas Temperature (EGT) sensor if it is found to be defective.
- Repair any damaged wiring or connectors in the EGT sensor circuit.
- If necessary, replace the Engine Control Module (ECM) if it is determined to be faulty.
How to erase DTC P14B4 on BMW
To erase the DTC P14B4 on a BMW, you can use a diagnostic scanner to clear the fault code after the underlying issue has been addressed. Once the repair or replacement of components related to the EGT sensor circuit is completed, use the scanner to erase the DTC P14B4 code from the Engine Control Module (ECM) memory.
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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