BMW DTC P140D – Secondary Air Injection System Switching Valve, Solenoid-Actuated, Stuck Open
DTC P140D meaning on BMW
The DTC P140D fault code on BMW vehicles indicates an issue with the Secondary Air Injection System Switching Valve, Solenoid-Actuated, being stuck open. This valve is responsible for controlling the flow of air into the exhaust system to help reduce emissions during cold starts.
BMW DTC P140D symptoms
Symptoms of the DTC P140D on a BMW may include rough idling, decreased engine performance, increased emissions, and the illumination of the check engine light on the dashboard.
BMW DTC P140D causes
The most common causes of the DTC P140D on BMW vehicles are a faulty Secondary Air Injection System Switching Valve, Solenoid-Actuated, or a wiring issue related to the valve.
BMW DTC P140D seriousness
While the DTC P140D fault code may not cause immediate drivability issues, it can lead to increased emissions and potential long-term damage to the vehicle’s emissions control system if left unresolved.
How to diagnose DTC P140D on BMW
To diagnose the DTC P140D on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault code and then perform a visual inspection of the Secondary Air Injection System Switching Valve, Solenoid-Actuated, and its wiring for any signs of damage or corrosion.
How to fix DTC P140D on BMW
To fix the DTC P140D on a BMW, the faulty Secondary Air Injection System Switching Valve, Solenoid-Actuated, would need to be replaced with a new one. Additionally, any damaged wiring should be repaired or replaced to ensure proper functionality.
How to erase DTC P140D on BMW
After the issue causing the DTC P140D on a BMW has been fixed, the fault code can be erased using a diagnostic scanner. This will reset the check engine light and clear the code from the vehicle’s 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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