Catalytic Converter: Testing and Inspection

At rear of engine compartment (next to the valve cover) on right side, is a test port for connecting a CO meter.
1. Run engine to operating temperature.
2. Unscrew the test port cap and connect a CO meter.
3. Measure and note CO content.
4. Remove CO meter and screw on test port cap.
5. Measure and note CO content at tailpipe.
6. Compare the two reedings. CO content should be substantially lower at tailpipe outlet.
7. Replace catalytic converter if readings are identical.