Scantool Diagnostics

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

Monitor GDS Data

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




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