Scantool Diagnostics

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 (S1), HO2S (S2)" parameter on GDS.








4. Are the parameters displayed correctly?