The linear O2 sensor is mounted on the front side of the Catalytic Converter (warm-up catalytic converter) or in the front exhaust pipe. It detects a wide range of air/fuel ratios in the exhaust gas from the rich to lean regions. This linear O2 sensor produces a current that corresponds to a specific air/fuel ratio. The PCM monitors this signal and determines whether the air/fuel mixture is rich or lean. The PCM constantly monitors the linear O2 sensor and increases or decreases the fuel injection duration using this signal. This is called closed-loop fuel control operation.
If the HO2S signal voltage is fixed at rich status, then feedback control is no longer possible, the PCM sets DTC P2196.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Characteristic line middle shift | 1. Poor connection or damaged harness 2. Front HO2S |
Enable Conditions |
•
No relevant failure
•
10volt ＜ battery voltage ＜ 16 volt | |
Threshold value |
•
Active test symptom during shift of lambda setpoint to rich or lean ( after P2096 / P2097 detection) | |
Diagnosis Time |
•
10 sec | |
MIL On Condition |
•
2 driving cycle |
