Catalytic Converter, Checking

Observe all safety precautions: SAFETY PRECAUTIONS 

View clean working conditions: CLEAN WORKING CONDITIONS 

Prior to repair work, perform a preliminary check to verify the condition. Refer to PRELIMINARY CHECK .

Special Tools And Workshop Equipment Required 

• Generic scan tool

Test Requirements 

• Battery voltage at least 12.5 volts
• No leaks or damage to the exhaust system.
• Oxygen sensors OK

Test Procedure 

-- Perform the function test in Diagnostic Mode 06. Refer to DIAGNOSTIC MODE 06 - READ TEST RESULTS FOR SPECIFIC DIAGNOSTIC FUNCTIONS .

If the specified values are exceeded:

-- Check the exhaust system for leaks.

-- Repair as necessary.

If no leaks are found in the exhaust system, no O2 sensor codes set and only DTC P0420 is set:

-- Replace the catalyst. Refer to the appropriate Service Information for removal and installation procedures.

Final Procedures 

After repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .