If your car suddenly develops a rattling sound or banging sound then you may not need to panic just yet, but you should always get it checked out as soon as possible. A rattle or banging sound can simply be a loose or broken bracket on the exhaust, for example, but if not checked and replaced it could mean that your exhaust system will loosen over time and even fall off costing you a lot more to replace.
Most garages will give the car a quick inspection on the ramps to discover what the issue is free of charge and under no obligation. They may also advise you of any potential problems such as brakes or tyres that will need replacing shortly.
Even if the noise is relating to an issue that doesn’t need to be fixed immediately, then knowing in advance will give you the time to shop around for the best price and save any more needed to pay for it.