Catalytic Converter Replacement

Step by step repair guide on how to replace a catalytic converter. This repair was perform on a VW Turbo Beetle. This article pertains to many similar vehicles.

Difficulty Scale: 4 of 10 Tools and Supplies Needed

  • Pry bar
  • Socket set
  • Wrench set
  • Replacement catalytic converter
  • Shop towels
  • Protective eyewear and gloves
Begin with the car safely in the air enough to work on the exhaust system.

Step 1 - Exhaust systems tend to rust the mounting bolts of the system. To help dis-assembly spray the bolts on the manifold and other connections with penetrating lube to help loosen.

Applying WD40 to Rusted Exhaust System Bolts

Step 2 - While the anti-rust liquid is settling in, locate and disconnect the oxygen sensor electrical connectors that are mounted on the converter.

Disconnecting Oxygen Sensors

Step 3 - After the connectors have been released, follow the wiring and removing them from their holders.

Removing Oxygen Sensor Wiring


Written by
Co-Founder and CEO of
35 years in the automotive repair field, ASE Master Technician, Advanced Electrical and Mechanical Theory.


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Article first published (Updated 2015-01-06)