BMW DTC P1420 – Secondary Air Injection Valve Control Circuit Electrical
DTC P1420 meaning on BMW
The Diagnostic Trouble Code (DTC) P1420 for BMW refers to an issue with the Secondary Air Injection (AIR) system’s valve control circuit. This code indicates that there is an electrical fault in the circuit that controls the Secondary Air Injection Valve.
BMW DTC P1420 symptoms
Symptoms of DTC P1420 on a BMW may include:
- Check Engine Light (MIL) illuminated on the dashboard
- Reduced engine performance or rough idling
- In some cases, the vehicle may fail emissions testing
BMW DTC P1420 causes
The common causes of DTC P1420 on a BMW include:
- Faulty Secondary Air Injection Valve
- Wiring or connector issues in the valve control circuit
- ECU (Engine Control Unit) malfunction
BMW DTC P1420 seriousness
While DTC P1420 may not cause immediate drivability issues, it is essential to address this problem promptly. Ignoring this fault can lead to increased emissions, reduced fuel efficiency, and potential long-term damage to the engine components.
How to diagnose DTC P1420 on BMW
To diagnose DTC P1420 on a BMW, you can follow these steps:
- Use an OBD-II scanner to retrieve the fault code and freeze frame data
- Inspect the wiring and connectors related to the Secondary Air Injection Valve
- Test the Secondary Air Injection Valve for proper operation
- Check the ECU for any stored codes or malfunctions
How to fix DTC P1420 on BMW
To fix DTC P1420 on a BMW, you can consider the following actions:
- Replace the faulty Secondary Air Injection Valve
- Repair or replace any damaged wiring or connectors in the valve control circuit
- If the ECU is faulty, it may need to be reprogrammed or replaced
How to erase DTC P1420 on BMW
To erase DTC P1420 on a BMW, you can use an OBD-II scanner to clear the fault code. After addressing the underlying issue causing the fault code, you can reset the code using the scanner. Ensure that the problem is 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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