Which occurrence could cause the demand curve for cars in your city to shift to the left?

First of all, let's clarify what the shift of the demand curve to the left means. The curve shifts that way implies a higher demand for cars in the city. Demand being a function of price will grow as the price goes down. Therefore, an occurrence that could lead to the curve leftward shift is for example a vast promotional campaign on cars, bringing about discounts, therefore cutting prices of such products.