Have had a resonance from the rear end more or less from new,thought it was the parcel shelf area BUT NO !!!!

Check your rear lights where they meet your bumper, mine had NO clearance, they were actually touching !!

Quick trim removal, light cluster re adjusted, no more noise

i had that too

Have had a resonance from the rear end more or less from new

I have the same problem - I put it down to too much booze and a bad diet

I know this is a fabia thread but I did have a similar problem with the octavia.The big plastic surround(that presumably covers the rear wiper motor) kept unclipping.A swine to clip back in to.

May be worth a look