Volvo V70 bj. 99 – ECU defective ?

Good day, I’m new here in the forum, had already read yesterday with you and describe the following problem. Wednesday I start the old Volvo V70 to go shopping. Jump on briefly, and go out again immediately. Otherwise everything in the green area, speed normal, no warning signals or messages. Several times tried, time and again the same game. Now as a woman I am not a car mechanic and have a towing to a workshop in which I was already, – organize The next day, the total disillusionment. Workshop called and said that they had read out, that the control unit would probably be defective. A new one would not be worthwhile for the old treasure (the Volvo), costs would be in the four-digit range. I knew that I could not afford it now. Moreover, the lamda probe would not be in order (I already knew that) and probably the compression in one of the cylinders would be a little too low. There I was fix and foxi. I had a little chat with friends and I found you here yesterday and read something. A friend of mine is an electrical engineer who said that we should expand the control unit and he would check the soldering points. My husband opened the hood earlier, we found the part, opened the door and looked stupid. There is only a box in the box. I took a picture once. Of course, I don’t know which part is missing now. where’s that left? Workshop certainly didn’t open it, they’re reading from somewhere else, or not? Can’t you reach anyone on Saturdays, of course. I’ll let you take the photo I just took, maybe you can tell me if it’s the engine control unit now what’s still in there and the immobilizer is missing or if there’s only one device in the Volvo. In the pictures I’ve seen so far, there were always 2 such boxes in it. , because a) I’m attached to the Volvo, b) I can’t afford a new car now, but I’m pretty dependent on it.