BMW DTC P145C – Secondary Air Injection System Air Flow/Pressure Sensor Initialization, Pressure Difference Between 2 Driving Cycles (Bank 1)
DTC P145C meaning on BMW
The Diagnostic Trouble Code (DTC) P145C on a BMW indicates an issue with the Secondary Air Injection System Air Flow/Pressure Sensor Initialization, Pressure Difference Between 2 Driving Cycles on Bank 1. This code is specific to the secondary air injection system, which is responsible for reducing emissions by injecting fresh air into the exhaust system to help with combustion of unburned fuel.
BMW DTC P145C symptoms
Symptoms of DTC P145C on a BMW may include:
- Check Engine Light (MIL) illuminated
- Reduced engine performance
- Increased emissions
- Possible rough idling or misfiring
BMW DTC P145C causes
Common causes of DTC P145C on a BMW may include:
- Faulty Secondary Air Injection System Air Flow/Pressure Sensor
- Wiring or connector issues in the sensor circuit
- Problems with the secondary air injection system components
BMW DTC P145C seriousness
The seriousness of DTC P145C on a BMW lies in its impact on emissions and engine performance. While the vehicle may still be operable with this code present, it is important to address it promptly to prevent potential damage to the engine and to ensure compliance with emissions regulations.
How to diagnose DTC P145C on BMW
To diagnose DTC P145C 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 Injection System Air Flow/Pressure Sensor for any visible damage or signs of malfunction
- Check the wiring and connectors for any loose connections or corrosion
- Perform a smoke test to check for leaks in the secondary air injection system
How to fix DTC P145C on BMW
To fix DTC P145C on a BMW, the following steps may be taken:
- Replace the faulty Secondary Air Injection System Air Flow/Pressure Sensor
- Repair any damaged wiring or connectors in the sensor circuit
- Address any issues with the secondary air injection system components
- Clear the fault code and perform a test drive to ensure the issue has been resolved
How to erase DTC P145C on BMW
To erase DTC P145C on a BMW, the fault code can be cleared using a diagnostic scanner. After the repair has been completed and the issue resolved, the code can be cleared to reset the Check Engine Light. It is important to ensure that the underlying issue has been fixed before clearing the code to prevent it from reoccurring.
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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