Our A6 has the ECON light on. Got VCDS on the job and found there was a fault on the G65 sensor. Ordered one and found the car didn't actually have one. It had been removed for some reason. So I put it on and it just turns. As if the threads have been stripped slightly. So I cannot get the switch to tighten. Is there a way of repairing this without having to replace the aircon radiator.