Just noticed this problem recently. When it is really cold out now I notice on the left side when I hit a bump I sometimes hear this knocking noise. Kind of like a klunk, but it goes away after the car is warmed up. I have no idea what it could be. Anyone else experience this? I am going to bring it to Scion soon just incase.

 

i hear it when i go up a driveway or start off in 1st gear.

and yes sometimes its my sunroof but most of the time it isnt. ehh im over it

 

I heard that too, but everything its only once.

 

I hope this really isn't bad.

 

it's probably the body/chassis flexing...maybe the sunroof. there's about as much glass as there is metal on the car.