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there is a small vapour leak in the fuel sytem of your car.
this doesn`t mean your leaking liquid gas -only a small amount of fuel vapours.
the emmission system of today`s vehicle are very sensitive, and when the car`s computer monitors this, it will display this information thru your dash warning light.
yor car is still safe to drive, but eventually you will have to fix this problem in order to pass a drive -clean -emmission test. See your service repair shop for further diagnostics..
It would not be enough just to have the codes cleared. Whatever caused the warning to come on the first time, must be attended to and rectified. As the warning is still coming on it means the reason has not yet been attended to.
The vibration as you've described it may be caused by the same problem, as it would seem to be coming from rough engine performance and could be related to the emission control.
The jolt you're experiencing would seem to be something to do with the brakes....I would suggest that further investigation is required with particular attention paid to the fitting of the calipers.
You should get it to a car repair shop and have the error codes from the engine control unit pulled. It makes no sense to guess what it could be in reasonably modern cars, not on these indications where the ECU tells you it has found errors that need to be fixed.
The engine control unit records data on most kinds of error conditions that can occur and usually provides very good information to pinpoint the problem. This makes the repair as inexpensive as possible for you.
I may want to get an OBD-2 code reader it does run scans on the emission sensors( fumes capture, evap, ehxaust recirculation....). there are too many things going on at once to really pinpoint the exact problem. I tried.
service light is only there to warn you, the car need service. (interval service). any of the repair shop should be able to do the job. you can drive the car just as is. no harm done.
make sure the car pass emmission test. O2 senser.
My suggestion is to get the fault codes stored in the car's ecu read by a VW approved garage. That will tell them what "was" wrong. Once a fault has occurred the check engine light will probably stay on until the warning has been cancelled using VW software.
As for the grade of gas used in the car, the users manual will tell you that - it might also be written inside the filler cap.
I wouldn't recommend further use of "engine cleaner" - it might do more harm than good.
Go get the codes read and then you'll know for sure.