How to Replace Catalytic Converter
Learn how to replace catalytic converter with our detailed step-by-step guide. Follow our easy instructions to get it done right.
Your Progress
0 of 6 steps completedStep-by-Step Instructions
1 Step 1: Diagnose Failed Catalytic Converter
Step 1: Diagnose Failed Catalytic Converter
Check for P0420/P0430 codes, rattling noise, sulfur smell, or failed emissions test.
OBD2 Scanner
Code reader for diagnosing catalytic converter issues
2 Step 2: Purchase Correct Replacement Converter
Step 2: Purchase Correct Replacement Converter
Buy OEM or high-quality aftermarket catalytic converter for your vehicle (check state regulations).
Catalytic Converter
Direct-fit replacement converter for your vehicle
Catalytic Converter Guide
Book on emissions systems and converter replacement
3 Step 3: Lift Vehicle and Spray Penetrating Oil
Step 3: Lift Vehicle and Spray Penetrating Oil
Raise car safely, spray bolts/clamps with penetrating oil, wait 15 minutes before removal.
Penetrating Oil Spray
PB Blaster for loosening rusted exhaust bolts
Floor Jack and Stands
Hydraulic jack with safety stands for lifting vehicle
4 Step 4: Remove Oxygen Sensors
Step 4: Remove Oxygen Sensors
Disconnect O2 sensor wiring, use oxygen sensor socket to remove sensors from old converter.
Oxygen Sensor Socket
Special socket for removing O2 sensors without damage
5 Step 5: Unbolt and Remove Old Converter
Step 5: Unbolt and Remove Old Converter
Remove bolts or cut clamps connecting converter to exhaust pipes, lower out old converter.
Exhaust Clamp Cutter
Tool for cutting rusted exhaust clamps
Socket Set
Metric sockets for removing converter bolts
6 Step 6: Install New Converter and Test
Step 6: Install New Converter and Test
Install new converter with gaskets, reinstall O2 sensors, clear codes, verify repair with scanner.
Exhaust Gasket Set
Gaskets for converter flange connections
Anti-Seize Compound
Lubricant for O2 sensor threads