BMW DTC P1406 – Internal EVAP System Leak Detection Module Error
DTC P1406 meaning on BMW
The Diagnostic Trouble Code (DTC) P1406 on a BMW indicates an Internal EVAP System Leak Detection Module Error. This error code is related to the vehicle’s Evaporative Emission Control System, which is responsible for capturing and storing fuel vapors to prevent them from being released into the atmosphere.
BMW DTC P1406 symptoms
Symptoms of DTC P1406 on a BMW may include:
- Check Engine Light illuminated on the dashboard
- Decreased fuel efficiency
- Strong fuel odor near the vehicle
BMW DTC P1406 causes
The DTC P1406 on a BMW can be caused by various factors, including:
- Defective EVAP System Leak Detection Module
- Leaking or damaged EVAP system components
- Loose or damaged fuel cap
BMW DTC P1406 seriousness
While DTC P1406 may not cause immediate drivability issues, it is important to address this error code promptly. Ignoring this issue can lead to increased emissions, reduced fuel efficiency, and potential damage to the vehicle’s emission control system.
How to diagnose DTC P1406 on BMW
To diagnose DTC P1406 on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the error code
- Inspect the EVAP system components for leaks or damage
- Check the fuel cap for proper sealing
- Test the EVAP System Leak Detection Module for functionality
How to fix DTC P1406 on BMW
To fix DTC P1406 on a BMW, the following steps may be taken:
- Replace the faulty EVAP System Leak Detection Module
- Repair or replace any leaking or damaged EVAP system components
- Ensure the fuel cap is tightened properly or replace if necessary
- Clear the error code and reset the Check Engine Light
How to erase DTC P1406 on BMW
To erase DTC P1406 on a BMW, the error code can be cleared using a diagnostic scanner. After addressing the underlying issue causing the error code, the mechanic can reset the Check Engine Light and verify that the code 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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