ECM/PCM assumes Lambda sensor is out of control and shows P2196 when upstream O2 sensor displays rich condition in spite of continuous correcting by downstream O2 sensor.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Check Signal Stuck Rich | 1. Poor connection or damaged harness 2. Upstream O2 sensor |
Enable Conditions |
•
950℃ > Exhaust gas Temp > 400℃
•
Required lambda = 1
•
Integrated exhaust gas mass after above conditions are met > 2g | |
Threshold Value |
•
Secondary control variable by downstream O2 sensor is lower than -0.07 | |
Diagnostic Time |
•
40 sec. | |
MIL ON Condition |
•
2 Driving Cycle |
