General Information

P0140 O2 Sensor Circuit No Activity Detected (Sensor 2)

General Information

Component Location





General Description

HO2S (B1/S2) is in the rear side of Catalytic Converter to check the proper operation of catalyst. Oxygen density after the catalytic converter has to be within specific range (around 0.5 V when there is no acceleration and deceleration.)
If the oxygen density changes in accordance with HO2S (B1/S1), it means the poor performance of catalytic converter.

DTC Description

If there is not any signal activity, ECM sets DTC P0140.
(This DTC might be caused by the malfunction of Heater circuit, so, check the heater circuit first.)

DTC Detecting Condition





** B1S1 : upstream oxygen sensor / B1S2 : downstream oxygen sensor

Specification





Schematic Diagram





Signal Waveform