Most small cars have petrol engines, while larger vehicles often come with diesel engines. Diesel engines have long held a bad reputation for noise and pollution, but they have come a long way in recent years. Diesels are usually the best option financially if you tend to make a lot of long journeys, diesels are not as economic if you mainly use a car to drive around town or do short trips.

Using an automotive diagnostic scan tool or code reader gives you an easy way to diagnose and fix problems with your vehicle. Read out step-by-step guide on how to use one, when you should use one and a video demonstration