BMW DTC P1422 – EVAP System Incorrect Purge Flow (Bank 2)
DTC P1422 meaning on BMW
The Diagnostic Trouble Code (DTC) P1422 for BMW indicates an issue with the Evaporative Emission Control System, specifically related to incorrect purge flow on Bank 2. This fault code is triggered when the Engine Control Module (ECM) detects that the purge flow in the EVAP system is outside of the expected parameters.
BMW DTC P1422 symptoms
Symptoms of DTC P1422 on a BMW may include:
- Check Engine Light (MIL) illuminated on the dashboard
- Decreased fuel efficiency
- Strong fuel odor near the vehicle
- Rough idling or stalling
BMW DTC P1422 causes
Common causes of DTC P1422 on a BMW include:
- Leaking or damaged EVAP system hoses
- Defective purge valve
- Malfunctioning EVAP canister
- Faulty fuel tank pressure sensor
BMW DTC P1422 seriousness
While DTC P1422 may not cause immediate drivability issues, it should not be ignored. Ignoring this fault code can lead to increased emissions, potential damage to the engine components, and may cause the vehicle to fail emissions tests.
How to diagnose DTC P1422 on BMW
To diagnose DTC P1422 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the EVAP system components for leaks or damage
- Test the purge valve and canister for proper operation
- Check the fuel tank pressure sensor for any faults
How to fix DTC P1422 on BMW
To fix DTC P1422 on a BMW, the following steps may be taken:
- Repair or replace any damaged EVAP system hoses
- Replace the faulty purge valve if necessary
- Inspect and replace the EVAP canister if it is defective
- Test and replace the fuel tank pressure sensor if it is malfunctioning
How to erase DTC P1422 on BMW
After the necessary repairs have been made to address DTC P1422 on a BMW, the fault code can be erased using a diagnostic scanner. This will clear the code from the ECM’s memory and turn off the Check Engine Light. It is important to ensure that the underlying issue causing the fault code has been resolved before clearing the code.
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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