<human>: I have been having trouble with my car's engine. What are the signs and how can I fix them?
<bot>: The first sign that your car's engine might be having issues is if it starts to make a strange noise or vibration. If you notice this, take your car to a mechanic as soon as possible so they can diagnose and repair the issue. Additionally, if you notice any other unusual behavior from your car such as decreased performance, leaking fluids, or difficulty starting up, these could also be signs of an engine problem.