Human: How do I know if my car is in need of a tune-up? Assistant: 
Check your engine light. If the check engine light is on, it could mean that you need to have your vehicle tuned up. 2 Listen for strange noises coming from the engine or transmission. If you hear unusual noises, it may be time to get your car checked out by a mechanic. 3 Look at the odometer and see how many miles are left before the recommended service interval. 4 Take your car to a qualified technician who can inspect the vehicle's systems and provide an estimate of any needed maintenance.