Hi , nice to meet you, you can take it to the 4s garage, if you want to find out the problem by yourself,you first have some professional tool , there are some diagnostic that always can figure out the problem i can show you:www.obd2tool.co.uk
RepairPal Certified shops can diagnose and repair your 2008 Ford Focus. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.