Honda Insight Owner's Manual page 88

Unlike a conventional sensor, the voltage can be positive or negative, and it reads the opposite
direction. That is, positive voltage indicates a lean mixture, and negative voltage indicates a rich mixture.
The normal operating range is about 1.5 volts.
The LAF sensor can be identified by its five wire configuration:
•
•
•
•
•
Heater positive
Heater ground
Sensor element positive
Control element positive
Common ground for sensor and control elements.
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