My car’s speedometer shows a speed of 10 km/h higher than the actual speed. Normal?

On our Mercedes-Benz, we saw a difference in speed of 10 km / h: in other words, the car shows 110 km / h when traveling at 100 km / h. The dealer told us that this difference was considered “normal”, an answer we did not accept. After a complaint to Mercedes-Benz Canada, we got a refund and a repair under warranty, but the difference of about 5% remains.

Have you ever heard of this type of problem? Please note that the car has its original tires, so the tire size does not affect the speed shown.

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Hi Claude,

Let me tell you that I see these situations especially in German cars. I myself own a Volkswagen in which the difference is 6-7% (extra). Not only does it show a speed that is distorted compared to reality, but the odometer accumulates high mileage. This means that after 100,000 km travel, my car can show 107,000 km. Therefore, this affects its market value and can also cause the manufacturer to refuse to repair parts under warranty if the car is a few thousand kilometers from being covered again.

That Mercedes-Benz acknowledged the problem and compensated you is to its credit. Because often, this type of situation is difficult to prove. Manufacturers also consider that there is a buffer zone of a few km/h that is considered acceptable. Where is this line found? It’s not always easy to be right.

Even better if you win your case. This will prove, should you need to make a claim, that the car has a little more mileage than it does. Finally, a good tip to verify the speed at which you are driving is the Waze app. The speed displayed on it is very accurate and shows you clearly if there is a difference with what your car is showing.