P0135 O2 Sensor Heater Circuit (Bank 1/Sensor 1): DTC Detecting Condition

DTC P0135 DETECTING CONDITION TABLE

Item	Detecting Condition	Possible Cause
DTC Strategy	Heater current check	Poor connection Open or short to ground in control circuit B1S1 ECM/PCM
Enable Conditions	Exhaust gas temperature (model):200~550°C (392~1022°F) Intake air temperature > -7°C (19.4°F) Battery voltage 10.7~16.1 V
Threshold Value	Internal resistance > threshold f (exh. temp, heater power)
Diagnostic Time	Above 15 sec
MIL ON Condition	2 driving cycle
B1S1: upstream oxygen sensor/B1S2: downstream oxygen sensor