If your car is suffering from faulty injector / injector loom then please contact VOSA as they are looking into the matter.
If the loom / injector fails completely, the engine will stall and you'll be driving a car without assisted steering and brakes which, potentially, could be catastrophic. As such, they're keen to hear from anyone with this problem.
VOSA are apparently informing Audi to replace the looms and injectors.
Initially, Audi were only replacing the faulty injector or loom but VOSA have recently advised some owners that Audi should replace all injectors and looms.
If your car has faulty looms / injectors contact VOSA; the more cases that VOSA are aware of, the more likely it is that Audi will have to recall all potentially affected vehicles.