dyi catalytic converter lock

diy catalytic converter lock

diy catalytic converter lock

Catalytic converters are an essential part of your car’s exhaust system. They help to reduce harmful emissions and improve the overall performance of your vehicle.

Unfortunately, catalytic converters are also a popular target for thieves, who can sell them for a high price.

If you want to protect your catalytic converter, you may want to consider installing a catalytic converter lock.

In this blog post, we will show you how to make a DIY catalytic converter lock that you can install yourself.


  • Welding machine
  • Steel rod
  • Steel plate
  • Cutting tool
  • Grinding tool

Step 1: Cut the Steel Rod

  • Measure the diameter of your catalytic converter accurately.
  • Cut a steel rod to fit snugly around the converter.
  • Ensure the rod is long enough to extend at least 6 inches on either side of the converter.

Step 2: Weld the Steel Plate to the Steel Rod

  • Take the steel plate and weld it to the end of the steel rod.
  • The plate should be large enough to cover the entire end of the rod and provide a surface for welding.

Step 3: Grind the Steel Plate to Fit the Exhaust Pipe

  • Use a grinding tool to shape the steel plate to fit snugly around the exhaust pipe.
  • The plate should fit tightly enough to prevent the rod from moving but still be able to rotate around the converter.

Step 4: Install the Lock

  • Slide the steel rod around the catalytic converter, ensuring that the plate is resting against the exhaust pipe.
  • Use the welding machine to attach the rod to the pipe, securing the lock in place.

Step 5: Test the Lock

  • Start your engine and check for any vibration or movement in the lock.
  • If everything is secure, you can be confident that your catalytic converter is protected from theft.


  • Ensure accurate measurement of the catalytic converter diameter.
  • Weld the steel plate securely to the end of the steel rod.
  • Ensure the plate fits tightly around the exhaust pipe.
  • Weld the steel rod securely to the exhaust pipe.


  • Do not skimp on materials. Use high-quality steel for the rod and plate.
  • Do not compromise the tight fit of the plate around the exhaust pipe.
  • Do not skip testing the lock after installation.

With this DIY catalytic converter lock, you can protect your vehicle and have peace of mind, knowing that your converter is secure.

The process is simple and affordable and can be completed with basic welding skills and tools.

It is important to mention that if you have no experience welding, it can be dangerous, as you might damage parts of the car, like the gasoline tank or fuel lines and this is a fire hazard, please be careful, also you can damage the catalytic converter itself.

also it’s very important to mention that when the time comes to replace your catalytic converter it won’t be as easy to take out.

if you don’t do this correctly you are going to hear a lot of noise and rattle.

if you do not have the skills or know someone that has, we recommend buying a premade solution 

In conclusion, catalytic converter theft is a growing problem, but with a little effort and some basic welding skills, you can protect your vehicle from theft and keep your catalytic converter safe.

Try this DIY catalytic converter lock today and enjoy peace of mind knowing that your vehicle is protected.