Bad Catalytic Converter Symptoms

5 Best Symptoms of Catalytic Converter Theft

There are bad catalytic converter symptoms that you ought to know. Since a catalytic converter located in the exhaust system it converts harmful emissions coming from combustion into safer  gasses for the environment. Here is a list of Bad Catalytic converter symptoms.

Catalytic Converter.

Hi. Welcome to this article. Today we’re going to learn symptoms of converter theft. The catalytic is one of the most stolen car part according to car mechanics. Here you will get a good list of symptoms that shows you have a stolen or a missing car catalytic. Welcome and lets read together.



The purpose is to convert harmful emissions coming from combustion into safer  gasses for the environment.

Your catalytic will be located and the exhaust system.

Here are Signs of theft.


Check Engine Lights on all the Time.


This is the first sign and you might experience with a bad a catalytic is having your check engine light on all the time.

Bad Catalytic Converter Symptoms

  1. P0420,
  2. P0421,
  3. P0422,
  4. P0423,
  5. P0424,
  6. P0425,
  7. P0426,
  8. P0427,
  9. P0428,
  10. P0429,
  11. P0430,
  12. P0431,
  13. P0432,
  14. P0433,
  15. P0434,
  16. P0435,
  17. P0436,
  18. P0437,
  19. P0438,
  20. P0439

You can read these codes by going to the car parts store near you and they’ll most likely do it for free. Or you can buy the scanner and scan the entire car yourself.

It’s possible that you can have a bad catalytic converter with no check engine light on

 A rotten eggs smell.

While you’re driving if the honeycomb inside the catalytic converter is broken or clogged it won’t be able to convert the smelling gas called hydrogen sulfide into an odorless gas. Resulting in a rotten eggs smell.

 Failed emissions test.

The whole purpose of the catalytic converter is that it converts harmful emissions into safer gasses for the environment.  If it has a fault or missing, the bad catalytic converter can never convert these gases result in a fail emissions test.

Lack of engine performance because of catalytic converter theft

Imagine you are at a red light looking at your opponent on the running track.

The light turns green you for it only to find out you’re late and both cars had up to 3000 RPM. This can happen if you’re catalytic converters dirty or clogged, the reason you would lose performance is that of the inability to breathe out the exhaust gases.

Bad Catalytic Converter Symptoms
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Let me give you an example.

Now try to run around the track with the mask on, it’s going to be harder to exhale through the restriction of the air caused by the mask this is how a dirty catalytic converter.

Elon Musk Carbon Capture technology

Because of that, the catalytic converter gases will have nowhere to go but the stay in the combustion chamber.  These gases take up space instead of air messing up the air ratio preventing perfect combustion.


  Rattling noise coming from the catalytic.


The rattling always can be a broken down honeycomb rich condition could cause this mean in the air / fuel ratio was not correct. Having more fuel than air was actually needed this extra fumes gets kicked into the bad catalytic converter increasing the temperature to where breaks the honeycomb.

Fix the problem right away to prevent the honeycomb from shattering causing the rattling noise.

Replacing can be very expensive if you suspect the clogged catalytic converter and wanna save some money clean it with this catalytic cleaning chemical


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