My car is showing me approximately 10km/h of less speed. I used to be tensed that why isn’t my car reaching higher speed which also is the issue and I am going to get it figured out by getting my catalytic converter checked and cleaned first but yesterday when my friend and I were riding our cars on highway so his car showed a speed of 110km/h whereas mine showed 100km/h and we being side by side. My car is a 2004 vitz with a digital speedometer. Can anyone help me out with resolving this issue? Because I don’t want mechanics and electricians to experiment.
