I have an 01” 320 base model with possibly same weird ticking noise. No ticking in the engine bay or under hood. Noise seaming to come from somewhere by trans. Pan. Or exhaust. Can hear best on sides of car vursus front? Anyone with similar problems fix there’s and can help a brother out. I was thinking cats.? But noise seams louder on passenger side. When got low seamed to come from trans or in that general area??? No codes on obd. Any ideas?or someone else have this problem?