BMW DTC P146C – Secondary Air Line Leaking (Bank 1)
DTC P146C meaning on BMW
The Diagnostic Trouble Code (DTC) P146C for BMW indicates a fault related to a Secondary Air Line Leaking on Bank 1. This means that there is a detected issue with the secondary air injection system on the specified bank of the engine.
BMW DTC P146C symptoms
Symptoms of a DTC P146C on a BMW may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Decreased engine performance
- Increased emissions
- Abnormal engine noise
BMW DTC P146C causes
Common causes of a DTC P146C on a BMW include:
- Leaking or cracked secondary air lines
- Faulty secondary air injection pump
- Problems with the secondary air injection valves
- Issues with the secondary air injection system sensors
BMW DTC P146C seriousness
The seriousness of a DTC P146C on a BMW should not be ignored, as it can lead to increased emissions, reduced engine performance, and potential damage to the catalytic converter over time. It is recommended to address this issue promptly to prevent further complications.
How to diagnose DTC P146C on BMW
To diagnose a DTC P146C on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and related data
- Inspect the secondary air lines for leaks or damage
- Check the secondary air injection pump and valves for proper operation
- Test the sensors in the secondary air injection system
How to fix DTC P146C on BMW
To fix a DTC P146C on a BMW, the following steps may be taken:
- Repair or replace any leaking or damaged secondary air lines
- Replace a faulty secondary air injection pump or valves
- Address any issues with the sensors in the secondary air injection system
- Clear the fault code and reset the Check Engine Light
How to erase DTC P146C on BMW
To erase a DTC P146C on a BMW, a diagnostic scanner can be used to clear the fault code from the vehicle’s computer. Once the issue has been addressed and fixed, the code can be cleared, and the Check Engine Light reset to ensure the problem 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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