Injectors can get a little pricey but if you can find original Bosch's for a good price, buy all 6.

I doubt the wiring is incorrect or messed up unless you were fiddling around with it.

Sometimes that pesky little o-ring on the injector fails also, you can look into that.

Maybe there is a way to clean your injectors? There must be a way of cleaning them without damaging them internally. Carb and choke cleaner? I don't know.

 

What specifically is the definition given for the injector codes? Leaky injectors or dry-rotted I-rings, as alluded to above, can cause issues. Before you move injectors around, get new o-rings - if they're already damaged, or one gets messed up while you're moving parts around, you're gonna be stuck and unable to drive the car.

 

Yeah lol we had some fuel leaking issue after we swapped the injectors around last night but we got it sorted. Otw out to the Audi here in a minute. Mildly hungover. Joy.