DTC P2099 Post Catalyst Fuel Trim System Too Rich (Bank 2): DTC Detecting Condition

DTC DETECTING CONDITION CHART

Item	Detecting Condition	Possible cause
DTC Strategy	Fuel Trim Rear Sensor Control Limits Exceeded	Air leakage in exhaust System HO2S TWC
Enable Conditions	Cell Enabled Barometric Pressure ≥ 74 kPa Intake Air Temperature ≥ -10 °C System Voltage ≥ 10.9936 V Closed Loop Active BLM learn Allowed Disabling Fault not present
Threshold value	Front O2 Sensor switch point ≤ 0.4V Rear O2 Sensor Voltage > 0.82V
Diagnosis Time	Fail count > 30 within 80 samples 250ms continuous loop
MIL On Condition	2 Driving Cycles