How to Replace Catalytic Converter

6 steps 30 min Intermediate

Learn how to replace catalytic converter with our detailed step-by-step guide. Follow our easy instructions to get it done right.

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Step-by-Step Instructions

1

Step 1: Diagnose Failed Catalytic Converter

Check for P0420/P0430 codes, rattling noise, sulfur smell, or failed emissions test.

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OBD2 Scanner

Code reader for diagnosing catalytic converter issues

$34.99
2

Step 2: Purchase Correct Replacement Converter

Buy OEM or high-quality aftermarket catalytic converter for your vehicle (check state regulations).

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Catalytic Converter

Direct-fit replacement converter for your vehicle

$299
Catalytic Converter Guide

Book on emissions systems and converter replacement

$18.99
3

Step 3: Lift Vehicle and Spray Penetrating Oil

Raise car safely, spray bolts/clamps with penetrating oil, wait 15 minutes before removal.

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Penetrating Oil Spray

PB Blaster for loosening rusted exhaust bolts

$9.99
Floor Jack and Stands

Hydraulic jack with safety stands for lifting vehicle

$89.99
4

Step 4: Remove Oxygen Sensors

Disconnect O2 sensor wiring, use oxygen sensor socket to remove sensors from old converter.

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Oxygen Sensor Socket

Special socket for removing O2 sensors without damage

$14.99
5

Step 5: Unbolt and Remove Old Converter

Remove bolts or cut clamps connecting converter to exhaust pipes, lower out old converter.

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Exhaust Clamp Cutter

Tool for cutting rusted exhaust clamps

$24.99
Socket Set

Metric sockets for removing converter bolts

$39.99
6

Step 6: Install New Converter and Test

Install new converter with gaskets, reinstall O2 sensors, clear codes, verify repair with scanner.

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Exhaust Gasket Set

Gaskets for converter flange connections

$16.99
Anti-Seize Compound

Lubricant for O2 sensor threads

$8.99