General Information: DTC Detecting Condition

Item	Detecting Condition	Possible Cause
DTC Strategy	Check HO2S Signal Amplitude	Leak in intake or exhaust system. Poor connection or damaged harness HO2S contamination
Enable Conditions	See CATALYST DIAGNOSIS (P0420) activation condition No relevant failure 11V < Battery voltage < 16V
Threshold Value	Integral (Lambda signal amplitude measured/Lambda signal amplitude of a slow sensor) > 1.0
Diagnostic Time	25 lambda controller cycle
Mil On Condition	2 Drive Cycles