First of all, it's not the V8, but my S2. Was on Monday a week ago, i.e. eight days ago, so at the car salon in Geneva, ran perfectly and had no start problems either, whether after breaks during the ride or after that stand all day in the parking lot. Now I put him in the garage, as always, and when I wanted to leave today, he just didn't start. I've tried a lot, the starter isn't turning, otherwise the car wouldn't move forward either, if I had a gear in it and the clutch didn't kick. I tried all 4 keys, one colleague (Automech) said it might be. the immobilizer, then followed his instructions (phone), to turn them off, but also does not seem to be the case. I checked all fuses. Battery is also good, I also tried with starter support cable for safety, but did not bring any improvement. I don't know if he's firing, nor do I know how to take out the spark plug to test it, because I don't know the location of the ZK and I don't want to take half the car apart because of that. So what else could it be? Petrol pump also seems to work, but it's best to check because of the wet ZK, isn't it? In any case, you hear them buzz when you turn on the ignition, and then turn it off again as normal.
If there's anything else I can do, let me know, and for all things like

I'm not so clever, with my Peugeot I could change spark plugs without any problems now, but here

PS: I don't want to bring the car back to the workshop, which has now been there for almost 1 month, replacing crossbars, hydrostoes, feather domes etc.