Why Is My Car Making a Rattling Noise When Idling?

A bad catalytic converter is the most likely culprit. Many issues can be responsible for the rattling sounds your car is making, but there are typical problems to look out for if your car rattles when idling. It’s bad enough that you have to drive with strange noises coming from your car, but what is just beyond annoying is rattling sounds grating your nerves and stealing your peace of mind every time you have to stop at a red light. The problem may be an easy fix that won’t put a dent in your pocket, or it could be a serious one requiring thousands of dollars to fix. So, Why Does My Car Rattle When Idling? I’ll bet you are familiar with an assortment of noises coming from your vehicle unless you’re a really newbie to Car and Driver. I’m just saying if you’ve been driving long enough, noises coming from your car are nothing new. The onus is on the driver to determine when the noise is normal and when it’s not, especially a rattling sound when the vehicle is stopped. If ...