I got a CEL two days ago, driving slow in traffic. CEL turned off by itself 1h or 2 later.
This evening, CEL is on.
I have the V-checker ECS vag scanner, so i can scan one module at a time. Did Engine, 09, 17, airbag, and some others. Some i could not connect ( i imagine i dont have those functions on the car).
If it was a vaccum leak, or other leak in the intake, would i have necessarily a CEL?
What module could it be since i dont feel a difference while driving, maybe a 3-4 psi lost at full boost. (that's why i was thinking maybe a hose leak).?