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 0.5V when there is no acceclation and deceleration.)

If the oxygen density changes in accordance with HO2S(B1/S1), it means the poor performance of catalytic converter.

DTC Description

If the sensor output is over 1.08 V under enable conditions, ECM sets DTC P0138.

( This DTC might be caused by the malfunction of Heater circuit, so, check the heater circuit first. )

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

● Signal check, high

● Poor connection

● Short to power in signal circuit

● B1S2

Enable Conditions

● After enough heated

● Battery voltage > 10.7V

● Catalyst temperature (model) : 350 ~ 800 ℃

Threshold Value

● B1S2 sensor voltage > 1.08 V

Diagnostic Time

● 5 sec

MIL ON Condition

● 2 driving cycle

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

Specification

Specification

0.1 ~ 0.9V

Schematic Diagram
note
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Signal Waveform
Яндекс.Метрика