Frequently Asked Service Questions Why is my check engine light on? How do I check my engine oil level? How often should I change my oil? How do I change a tire? How do I sync my phone to bluetooth? How do I change windshield wipers? How do I change my car battery? How do I increase fuel efficiency? How do I check the coolant levels? How do I check the transmission fluid? Air conditioning not cold? Why is my engine idle rough? What is wrong with my brakes? What’s a powertrain warranty? What do extended warranties cover?