OBD II scanner indicates Error P1494 related to the evaporative emission control system.

[sarah_bentley77]

Hello, I am encountering the aforementioned mistake and want assistance in comprehending the procedure I should follow to diagnose the issue. It is a detection of an evaporative leak. I have replaced the gasoline cap and cleaned the tank hole to ensure a secure seal. The code was cleared, however it reappeared after a fair duration.

Could someone provide guidance on the fault identification procedure? Any videos would be much appreciated.


Thank you in advance.

[BMW_Fan2020]

Examine the purge valve on the engine; if air can be expelled via it when disconnected, it is defective.

[sarah_bentley77]

Thank you. Is it also referred to as a PCV valve? Does this video demonstrate how to locate?

[sarah_bentley77]

https://www.youtube.com/watch?v=mxJEBQ78kGw

[BMW_Fan2020]

That is the engine breather, not the fuel tank ventilation.

You are seeking a compact solenoid with an inlet from the fuel tank and an outlet to the intake manifold.


Which engine is it?

[sarah_bentley77]

B48 2-liter petrol engine. It is a 2017 BMW 120i.

[BMW_Fan2020]

Remove the upper engine cover, and it should be clearly visible on the B48. Above the manifold

[sarah_bentley77]

I have removed it, and it is entirely obstructed, so I think it is functioning well. Do you have any more thoughts?

[sarah_bentley77]

Thank you. I will examine it shortly.

[sarah_bentley77]

I have deleted it, and it is blocked; thus, I presume it is functioning well.