DTC P0056 Ho2S Heater Control Circuit (Bank 2/Sensor 2): DTC Detecting Condition

DTC DETECTING CONDITION

Item	Detecting Condition	Possible Cause
DTC Strategy	Evaluate O2 sensor element temperature via measuring element resistance	Related fuse blown or missing Heater control circuit open or short Power supply circuit open or short Contact resistance in connectors Faulty HO2S
Enable Conditions	Sensor preheating and full heating phases finished Time after start elapsed: 180 sec. 11V < Battery voltage < 16V 1 % < Heater power < 99% Exhaust gas temp.model < 520°C (968°F)
Threshold Value	O2 sensor element resistance > 2900Ω
Diagnostic Time	5 min.
Fail Safe	Heater open loop control
MIL On Condition	2 Driving Cycles