If the sensor output is below 0.06 V under enable conditions, ECM/PCM sets DTC P0137.
(This DTC might be caused by the malfunction of Heater circuit, so, check the heater circuit first.)
Item | Detecting Condition | Possible Cause | |
DTC Strategy |
•
Signal check, low | 1. Poor connection 2. Short to ground in signal circuit 3. HO2S(S2) | |
General Enable Conditions |
•
Dew point end detected
•
Battery voltage is higher than 11V
•
Exhaust Gas temperature is higher than 280℃ and lower than 800℃
•
No upstream O2 sensor heater error | ||
Case 1 | Enable Conditions |
•
Engine speed is higher than 1200rpm and lower than 2520 rpm
•
Rear O2 sensor feed back control | |
Diagnostic Time |
•
25 sec. | ||
Case 2 | Enable Conditions |
•
Sensor in cold condition | |
Diagnostic Time |
•
0.1 sec. | ||
Threshold Value |
•
Sensor voltage is lower than 0.06V | ||
MIL ON Condition |
•
3 driving cycles | ||
※ S1 : upstream oxygen sensor / S2 : downstream oxygen sensor
