Bank 1

P0420 Catalyst System Efficiency below Threshold (Bank 1)

Scantool Diagnostics

Monitor Scantool Data

1. Connect GDS to Data Link Connector (DLC).
2. IG "ON".
3. Select "DTC" button, and then Press "DTC Status" to check DTC's information from the DTCs menu.
4. Read "DTC Status" parameter.




5. Is parameter displayed "Present fault"?