is 250c knocking noise rear drivers side

[Johnlex]

Drove my car on a back street bumpy road today and could hear a very annoying loud knocking noise from the rear.

I've checked the hood and made sure theres no lose bolts or anything that be causing it. Definitely not the roof !

ANYBODY GOT ANY IDEAS OR ISIT A TRIP TO THE MAIN DEALER. ALSO I HAVE AN EXTENDED WARANTY SO SHOULD BE COVERED ?

[madasahatter]

Is the spare wheel fully tightened down? Could be suspension or exhaust heat shield.

[johnatg]

This is sometimes caused by seized rear brake calipers/sliding pins. They can usually be freed and lubricated but if you go to a main dealer they'll want to replace the calipers at vast expense. Find an independent garage which understands IS250 s. 

Unless the MD will fix it under warranty. 

[Johnlex]

I don’t have a spare wheel as it’s a convertible. I will go underneath tomorrow and have a look. 
I changed all the front slider pins but didn’t on the back. I greased one side 
But I will have a look on the side that’s knocking. 
my feeling is it’s suspension / bushes