BMW DTC P24E7 – NH3 Sensor Heater Circuit Low
DTC P24E7 meaning on BMW
DTC P24E7 on a BMW refers to a fault with the NH3 (ammonia) sensor heater circuit being detected as low. The NH3 sensor is a crucial component in the Selective Catalytic Reduction (SCR) system, which helps reduce harmful emissions by converting nitrogen oxides into harmless nitrogen and water vapor.
BMW DTC P24E7 symptoms
Symptoms of a DTC P24E7 on a BMW may include the malfunction indicator light (MIL) or check engine light illuminating on the dashboard. Additionally, you may experience reduced engine performance or increased emissions.
BMW DTC P24E7 causes
The causes of a DTC P24E7 on a BMW can vary, but common reasons include a faulty NH3 sensor, damaged wiring or connectors in the NH3 sensor circuit, or a malfunctioning SCR system.
BMW DTC P24E7 seriousness
The seriousness of a DTC P24E7 fault code on a BMW should not be ignored, as it can lead to increased emissions and potential engine performance issues. It is recommended to address this issue promptly to ensure proper vehicle operation and compliance with emissions regulations.
How to diagnose DTC P24E7 on BMW
To diagnose a DTC P24E7 on a BMW, a diagnostic scan tool capable of reading BMW specific fault codes is required. The technician should inspect the NH3 sensor and its associated wiring for any visible damage or corrosion. Testing the NH3 sensor’s resistance and checking for proper voltage supply to the sensor heater can help pinpoint the issue.
How to fix DTC P24E7 on BMW
Fixing a DTC P24E7 on a BMW may involve replacing the NH3 sensor if it is found to be faulty. Ensure all wiring and connectors in the NH3 sensor circuit are in good condition and properly connected. Clearing the fault code and performing a test drive to verify the repair is recommended.
How to erase DTC P24E7 on BMW
To erase a DTC P24E7 on a BMW, a diagnostic scan tool capable of clearing fault codes is needed. Once the underlying issue has been addressed and fixed, the fault code can be cleared using the scan tool. After clearing the code, perform a final check to ensure the MIL or check engine light does not reappear.
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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