Dear Friends, Thanks a lot for such great reply. @Patchboy: Thx dear for the steps. The update: Today I drove the car for 10 km and no issue anymore. Seems gone! Bit in past: Just a week ago my car got new rear bumper and the Driver side lower body part got repaired (due of a damage). Might be that is the RCA. some very small gap was there between body and Driver side door.