What could be the possible causes of noise from rust buildup in a car that disappears when driving, and a check engine light due to a thermostat being out of range?

The possible causes of noise from rust buildup in a car that disappears when driving and a check engine light due to a thermostat is out of range are not directly related to each other but can have the following reasons: Noise from Rust Buildup - Rust buildup on various car components, such as exhaust pipes, mufflers, and heat shields, can cause noise when the car is idling. The noise may disappear when driving because of the increased airflow and decreased vibration. Check Engine Light Due to Thermostat - If the thermostat is stuck in an open position, it can cause the engine to run cooler than the desired temperature range, which can trigger the check engine light. Solutions to these issues may include replacing the rusted car components, cleaning or treating them to prevent further rust buildup, or replacing the thermostat with a new one. It's important to have the car inspected by a professional mechanic to diagnose the root cause of these issues and recommend the appropriate repairs.