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Honda Fit/Jazz - DTC Troubleshooting: P0420 (67-1) (5MT without ETCS)
Online Honda Fit/Jazz 2002-2005 Workshop repair manual used by professionals.
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Snip from the Manual
DTC Troubleshooting: P0420 (67-1)
DTC P0420 (67-1): Catalytic System Efficiency Below Threshold
NOTE: If some of the DTCs listed below are stored at the same time as DTC P0420, troubleshoot those DTCs first, then recheck for DTC P0420.
P0137, P0138: Secondary Heated Oxygen Sensor (secondary HO2S) (Sensor 2)
P0141: Secondary HO2S (Sensor 2) heater
1.Reset the ECM/PCM, then continue to 2 through 5 to reset the readiness code.
2.Start the engine. Hold the engine at 3,000 rpm (min-1) with no load (in Park or neutral) until the radiator fan comes on.
3.Drive for about 10 minutes without