What's really wrong with my Arauca car?

Hello, it is the first time that I am public in this community of specialists in engines and mechanics, I certainly do not know anything about it, the basic things like measuring the oil and what I have learned and heard since I have had a vehicle, that for 12 years.

It brings me to this community to share with you what is happening with my vehicle, I am a little distressed, surely you can help me, I have a vehicle in my country it is a Chery Arauca, I bought it from an agency 6 years ago and the truth is that there are few things what had to be done to it, its up-to-date maintenance, its timing belt change, it has 131 km and for me it is a good vehicle and above all super economical in gasoline consumption.

Two weeks ago I began to carry out its revision because I am going to make a trip or rather I am moving from the city, and whenever I made a long trip, I send it to be checked, I started with the alignment where the technician told me that a rubber had broken , and well, something that I have known for a few months, that it is necessary to change the steering jack, which, despite the fact that some tires were replaced, continued to lose a few drops of oil. In short, nothing that prevented me from traveling. I also balanced the tires and changed the engine oil. I needed to check the brakes and other fluids.

It turns out that on Tuesday of last week, I went to look for my car where I keep it and it didn't turn on, the battery no longer responded, fortunately my mechanic lives right across the street and helped me, that day he can solve the pending errands, but with the anguish that I ran out of battery.
On Wednesday I didn't take it out and I went to request a budget for the batteries and collect the money, the cheapest one costs $55 and the most expensive $68, and the galloping inflammation I remember when I bought the previous one, the very good one cost me $40 And it lasted almost two years. On Thursday I ask the mechanic for help again to recharge the battery to go out and buy mine, a very kind customer of the workshop offered me the battery of his car, but
it was 800 , it fit in the space but it was big and the wires on my car are very short. They helped me again and I went to buy my battery and that's it, I thought everything was solved.

In the afternoon, when I returned to store the vehicle, a red light came on, which I immediately remembered was the alternator, I took it to the mechanic and the vehicle has been there since that day. The alternator was checked and repaired, the shaft where the carbons go was repaired and as the mechanic told me, it was running well.
The mechanic took the opportunity to replace the top cover of the valve cover, which was broken and cleaned all the scattered oil, the spark plugs were cleaned and everything was cool. I even recharged the air conditioning gas right there.

The mechanic tested it and then he gave it to me on Saturday at 2 pm and I was doing some errands in it, I returned home to take the things I bought and I went to store the vehicle it was already 5:30 pm, well two blocks away two yellow warning lights came on, one with the letters EPC and the other with the figure of the engine, this situation prevented me from accelerating the vehicle. I call the mechanic again to notify him and he recommends that I change to second gear so that he can move forward a little and return it to the workshop.

On Monday they checked the vehicle, lowered the alternator again and checked the manifold and other things that I really don't understand. For reasons of rain and not being able to move the car, it was not possible to do the diagnosis with the scanner that day, on Tuesday the technician was found to go to the workshop to carry out the diagnosis and they informed me that it refers to the throttle body, to the what was done to him or service and then something that I did not understand much, was that they erased the fault in the scanner, the warning light disappears but only for a few minutes, they also inform me that the brake valve was checked, and the fault persists.

Today Wednesday we wait, I with a lot of patience and hope that the technician will return to scan again, since the mechanic tells me that he wants to be sure, if it is necessary to buy the spare parts or the scanner throws something else.

Well, and here I am waiting for tomorrow, not really knowing what my Chery Arauca has.