Noise reduction of two types of passengers cars due to some maintenance activities has been studied. The noise levels of the cars were measured before and after maintenance activities in service stations, as per the standard stationary test. A total of 91 cars were tested. The results of the measurements indicated that the routine maintenance activity of servicing and tuning resulted in an average noise reduction of about 1 dB(A). Noise reduction was greater in the case of the cars with specific problems such as in silencer, water pump and tappet. The rectification of a silencer problem resulted in an average reduction of about 5 dB(A) whereas about 3 dB(A) noise reduction was measured due to the rectification of water pump and tappet problems.