Scantool Diagnostics

Engine Control

P0420 Catalyst System Efficiency below Threshold (Bank 1) - Scantool Diagnostics

Monitor Scantool Data

1. Connect scantool to DLC (Data Link Cable).
2. Warm up the engine to normal operating temperature.
3. Monitor "HO2S" parameter on scantool.




Fig 1) Normal graph of front HO2S and rear HO2S at idle.
4. Are the parameters displayed correctly?