* Loose engine components. Over time, the nuts and bolts that hold the engine together can loosen, causing the engine to make a rattling noise. This is especially common if your car has a high mileage.
* Worn out belts. The belts that drive the engine's accessories, such as the alternator and power steering pump, can wear out over time and start to make a rattling noise.
* Faulty exhaust system. The exhaust system is responsible for carrying exhaust gases away from the engine. If the exhaust system is damaged or loose, it can make a rattling noise.
* Bad catalytic converter. The catalytic converter is a device that helps to clean the exhaust gases. If the catalytic converter is damaged or clogged, it can make a rattling noise.
If you're not sure what's causing the rattling noise in your Mazda Protege, it's best to take it to a mechanic for diagnosis.
