BMW DTC P146D – Secondary Air Line Leaking (Bank 2)
DTC P146D meaning on BMW
The DTC P146D on a BMW indicates a fault with the secondary air system on Bank 2. This fault code specifically points to a leak in the secondary air line on Bank 2 of the engine.
BMW DTC P146D symptoms
Symptoms of a DTC P146D on a BMW may include:
- Check Engine Light illuminated
- Reduced engine performance
- Increased emissions
- Engine may run rough or stall
BMW DTC P146D causes
Common causes of a DTC P146D on a BMW include:
- Leaking secondary air line on Bank 2
- Failed secondary air system components
- Electrical issues related to the secondary air system
BMW DTC P146D seriousness
The seriousness of a DTC P146D on a BMW should not be ignored. While the vehicle may still be operable, the fault can lead to increased emissions and potential engine performance issues. It is recommended to address this fault promptly to prevent further damage.
How to diagnose DTC P146D on BMW
To diagnose a DTC P146D on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault code
- Inspect the secondary air system components for leaks or damage
- Check the electrical connections related to the secondary air system
- Perform a smoke test to identify the location of the leak
How to fix DTC P146D on BMW
To fix a DTC P146D on a BMW, the following steps may be taken:
- Repair or replace the leaking secondary air line on Bank 2
- Replace any failed secondary air system components
- Repair any electrical issues related to the secondary air system
- Clear the fault code and test drive the vehicle to ensure the issue is resolved
How to erase DTC P146D on BMW
To erase a DTC P146D on a BMW, a diagnostic scanner can be used to clear the fault code from the vehicle’s computer. Once the repair has been completed and the fault code erased, the vehicle should be test-driven to ensure the issue has been resolved.
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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