Updated at: 21-04-2022 - By: micdot

if you want to know how to fix a rattle in your car’s exhaust system, check out this post! The rattle of the catalytic converter heat shield is one thing that happens a lot. This happens when the heat shield isn’t tight enough. Indeed, catalytic converters can get very hot. This type of temperature isn’t high enough to start the oil, transmission fluid, and grease on fire.

Metal rattling sounds can be a sign that your car or truck has a loose or broken heat shield. But how do you fix it? First, let’s learn how heat shield sounds. Also, read this post.

How Does A Heat Shield Rattle Sound?

These are some sounds you will hear if you have a loose or broken heat shield:

Rattling Sound

When you hear rattling sounds that sound like they’re coming from under your car, it could be coming from your catalytic converter, which helps your car run better. Even when the catalytic converter is hot, you may not hear it again.

Ticking or Knocking Noise

When you hear a ticking or knocking noise coming from the catalytic converter, this could be caused by one of a number of things. When the car is running, it does make this sound. Even if there is a leak in the exhaust, it could still be the reason for this. It doesn’t matter what you do, you’ll hear more noise from your catalytic converter as you speed up.

Catalytic Converter Heat Shield Rattle: How To Fix A Heat Shield Rattle

Here are the steps you need to take when you want to fix a Catalytic Converter Heat Shield Rattle.

Step 1: The bolts that hold the heat shield on the converter should be sprayed with penetrating oil about an hour before you start to work.

This is step two: Remove the heat shield bolts. It should be cleaned with soap and water. Take a look inside, it might be dull and dirty. Make sure to polish the inside of the heat shield with 200-grit, 400-grit, and 800-grit sandpaper. This will make it look shiny and bright.

This is the third step. Now, cut off two inches of the header wrap. In case you didn’t know, the header wrap is like a piece of fabric that goes around the main tubes to keep heat inside the header.

Half a dozen washers should be put around each one of the heat shield bolts. Keep them flat on the header wrap. As soon as you can, hit them with spray paint that dries quickly. Every time you take the washer off, you’ll be able to see a better outline of them on the header wrap. Cut the wrap washers with scissors, and cut the middle off with a penknife to get rid of them.

There should be no more oil on the bolt threads. Then, put a dab of an anti-seize compound the same size as a pencil eraser on each one. Wrap one or two of the wrap washers around the heat shield and the converter to keep them from getting too hot. Make sure the heat shield is back in place after you finish.

The screws that hold the heat shield on should be tightened to the manufacturer’s specs. But you should try to move the heat shield around. Wrap washers, on the other hand, should have taken up a lot of space. This is because the bolts have been stretched.

How Much To Fix Heat Shield Rattle

A repair shop needs to look at your car to figure out how much it will cost to fix the noise. In most cases, it costs between $150 and $500 to fix a rattle in a heat shield. If the parts are $150 or less, and it takes more than an hour of work, it should not cost more than $300.

Do I Need A Heat Shield On My Catalytic Converter?

When there is a hole in the exhaust system, your car may not run well unless it is fixed. You need to put a heat shield on your catalytic converter, and there’s a good reason why the manufacturer put it where it is.

Keep in mind that it is against the law to drive your car without a heat shield on the catalytic converter because it can get hot. The heat from the catalytic converter can get into the inside of the car, which could start a fire if you park on dry grass.

How To Fix Exhaust Heat Shield Rattle

Take the heat shield off when you use this simple method to fix it. This is because when you remove the heat shield, it can cause problems with sensors, wiring, and rubber parts that are very close together.

Steps to fix a Heat Shield Rattle:

1.The Screw Hose Clamp should be loosened up a little bit.

Hose clamps should be used to wrap the Exhaust Component and Heat Shield around each other, as shown in this picture.

2. While the engine is still warm, the exhaust component and heat shield should be wrapped with a hose clamp about a half inch around each other.

3: At this point, the Hose Clamp should be tightened to keep the Heat Shield in place.

When you use a flat blade screwdriver, you should tighten the hose clamp until the broken piece of the heat shield is very well held on to the exhaust manifold by the hose.

The heat shield should be tightened with another 2-3 hose clamps, which will make it more secure.

4.Make sure the Heat Shield isn’t loose.

You can shake the heat shield to see if it’s tight.

Cat Converter Heat Shield Rattle

In case you didn’t know, the catalytic converter is a part of the exhaust system in your car.

These catalysts, like platinum, help to make a chemical reaction that reduces the amount of harmful pollution in the air. Keep in mind that the catalytic converter is made up of three main parts.

Heat Shield for Catalytic Converter Rattle

The heat shields rattle is a piece of welded sheet metal inside a car that is meant for a catalytic converter. It can rust over time because it is exposed to daily wear and tear.

A big part of Heatshield for catalytic converter rattle is that it doesn’t just rip off the rattling heat shield. It’s also a safety measure.

With it, you can still drive your car, but it’s a safety feature that was made for cars for a reason.


Catalytic converter: This is one of the parts on your car that you should probably change if it gets bad even though it can be expensive. Whenever you find out that it’s shaking or squeaking, it’s time to get a brand new one.

There’s no need to buy a new one, though. You can try to clean it out to get it to work again.