DTC Advanced Diagnostics: P0141 (2.0L Engine) (2024 2025)
DTC P0141 : Secondary Heated Oxygen Sensor (Secondary HO2S (Sensor 2)) Heater Circuit Malfunction
General Description
In order to ensure a constant and appropriate operating temperature of the secondary heated oxygen sensor (secondary HO2S (sensor 2)), a heater is integrated and it is controlled and monitored by the powertrain control module (PCM). When the heater is activated, it heats the sensor to stabilize and speed up the detection of oxygen content when the exhaust gas temperature is cold. If the secondary HO2S (sensor 2) heater current or output voltage is other than a specified value, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 0.5 seconds or more |
| DTC Type | Two drive cycles, MIL on |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| 12 volt battery voltage [Battery] | - | 16 V |
| Vehicle | ON mode | |
[ ]: HDS Parameter
Malfunction Threshold
Any of the conditions occur:
- Short circuit to power
The secondary HO2S (sensor 2) heater output current is 12.5 A or more for at least 0.5 seconds while the power stage is on.
- Short circuit to ground
The secondary HO2S (sensor 2) heater output voltage is 2.74 V or less for at least 0.5 seconds while the power stage is off.
- Open circuit
The secondary HO2S (sensor 2) heater output voltage is between 3.26 - 4.7 V for at least 0.5 seconds while the power stage is off.
Possible Cause
The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- Secondary HO2S (sensor 2) SO2HT line open
- Secondary HO2S (sensor 2) SO2HT line short to ground
- Secondary HO2S (sensor 2) SO2HT line short to power
- Secondary HO2S (sensor 2) failure
- PCM internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC, the freeze data, and the on-board snapshot are stored.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.