Steering crunches

Hello together ! Since 2 1/2 months I have a 10 year old KA. Since yesterday the steering wheel crunches quite suddenly. No matter whether when driving or standing, it sounds as if there is sand or shingle paper somewhere in between. It is also irrelevant whether the engine runs or not. I just went to the dealer, he said it could be dirt or in the worst case any pinion ?! This could then have an effect in extreme case so that during the ride the steering wheel lock snaps in?? Can d I have already driven through the crack between the steering wheel and the LR pillar with a flap, but without success. What’s strange is that the sound has appeared from one second to the other. Has anyone experienced something similar? Thank you very much for your answers! LG Lexi