BMW DTC P1423 – Secondary Air System (Bank 1)
DTC P1423 meaning on BMW
The DTC P1423 on a BMW indicates a fault in the Secondary Air System for Bank 1. This system is responsible for reducing emissions during cold starts by injecting fresh air into the exhaust system to help with the combustion process.
BMW DTC P1423 symptoms
Symptoms of a DTC P1423 on a BMW may include:
- Check Engine Light illuminated
- Rough idle during cold starts
- Decreased engine performance
- In some cases, there may be no noticeable symptoms
BMW DTC P1423 causes
Common causes of a DTC P1423 on a BMW include:
- Faulty Secondary Air Injection Pump
- Blocked or leaking air lines
- Malfunctioning Secondary Air Injection Valve
- Electrical issues in the system
BMW DTC P1423 seriousness
While a DTC P1423 may not cause immediate drivability issues, it is important to address it promptly to ensure proper emissions control and overall engine performance. Ignoring this fault can lead to increased emissions and potential long-term damage to the engine components.
How to diagnose DTC P1423 on BMW
To diagnose a DTC P1423 on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault code
- Inspect the Secondary Air Injection Pump, air lines, and valve for any visible damage or blockages
- Check the electrical connections and wiring related to the Secondary Air System
- Perform a smoke test to identify any leaks in the system
How to fix DTC P1423 on BMW
To fix a DTC P1423 on a BMW, the following steps may be taken:
- Replace the faulty Secondary Air Injection Pump, air lines, or valve
- Repair any damaged or leaking components in the system
- Ensure all electrical connections are secure and free of corrosion
- Clear any blockages in the air lines
How to erase DTC P1423 on BMW
After fixing the issue causing the DTC P1423 on a BMW, the fault code can be erased 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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