I do not know why people do not like to give correct answers!

My friend, here in Qatar, there are professionals who here just here for the job, you are asking for!

There are several but just to give you one of them:

In Industrial area, just in front of the "Inspection Place", there are legal shops with all the modern gadgets and equipment and will fix your car problem and will guarantee that your car passes the test.

Just give them the traffic paper and let them have a look on the fault and you would see how they are quick in fixing the fault at very little money!