HONDA Insight - Manual (Page 88)

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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.