BMW DTC P1474 – Leakage Diagnostic Pump Reed Switch Does not Close
DTC P1474 meaning on BMW
DTC P1474 on a BMW indicates an issue with the Leakage Diagnostic Pump Reed Switch not closing properly. This switch is responsible for detecting leaks in the evaporative emission control system.
BMW DTC P1474 symptoms
Symptoms of DTC P1474 on a BMW may include the check engine light illuminating on the dashboard, decreased fuel efficiency, and potential issues with passing emissions tests.
BMW DTC P1474 causes
The most common causes of DTC P1474 on a BMW are a faulty Leakage Diagnostic Pump Reed Switch, a damaged wiring harness, or a problem with the evaporative emission control system.
BMW DTC P1474 seriousness
While DTC P1474 may not cause immediate drivability issues, it is important to address this code promptly to ensure proper functioning of the evaporative emission control system and to prevent potential damage to other components.
How to diagnose DTC P1474 on BMW
To diagnose DTC P1474 on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault code and then perform a visual inspection of the Leakage Diagnostic Pump Reed Switch and its wiring. They may also conduct a smoke test to check for leaks in the evaporative emission control system.
How to fix DTC P1474 on BMW
Fixing DTC P1474 on a BMW usually involves replacing the faulty Leakage Diagnostic Pump Reed Switch or repairing any damaged wiring. In some cases, cleaning or replacing the evaporative emission control system components may be necessary.
How to erase DTC P1474 on BMW
Once the underlying issue causing DTC P1474 on a BMW has been resolved, the fault code can be cleared using a diagnostic scanner. This will reset the check engine light and allow the vehicle’s onboard computer to monitor the system for any new faults.
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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