No, it's a full sequential injection. As a rule of thumb semi-sequential injection hasn't been used since the mid 80's. If it was a semi-sequential injection you would not get a fault on cylinder 3, only on group 1 and 2.
To make life a bit more complicated the French manufacturers start counting at the gearbox side, not the distribution side of the engine. And the fault codes may be in firing order. So a fault on the 3rd cylinder in the firing order (1,3,4,2) would be cylinder 4.
And yes, washer fluid may drip on the injector of cylinder 4.

There have also been reports of chaffing of the wiring loom on top of the engine.