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Home >> Honda >> 2012 >> Insight Base >> Repair and Diagnosis >> Engine Performance >> System >> Advanced Diagnostics >> DTC P0420: Catalyst System Efficiency Below Threshold >> Enable Conditions

Enable Conditions

Condition Minimum Maximum
Elapsed time that secondary HO2S activity is not monitored after starting the engine 15 seconds -
Engine coolant temperature 156 °F (69 °C) -
Intake air temperature -13 °F (-25 °C) -
Estimated TWC temperature 1,040 °F (560 °C) -
Vehicle speed 26 mph (41 km/h) -
Fuel trim 0.75 1.47
Fuel feedback Closed loop at stoichiometric
Monitoring priority P0133, P219A
No active DTCs set (prevents monitor from running) P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0122, P0123, P0133, P0134, P0135, P0137, P0138, P0139, P0141, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P0301, P0302, P0303, P0304, P0335, P0339, P0351, P0352, P0400, P0401, P0404, P0443, P0496, P0497, P0522, P0523, P060A, P1109, P1157, P1172, P145C, P1659, P2101, P2118, P2122, P2123, P2127, P2128, P2135, P2138, P2176, P2195, P219A, P2227, P2228, P2229, P2238, P2252, P2270, P2413, P2648, P2649, P2A00
Other Has record of deceleration at least once
Cruise load or more