oh okay

im not sure your sensor is lying, but narrowbands lie because:

- they are too cold
- there is wiring damage
- there is interference on the wire (like an arcing plug wire next to the o2 wire)
- there is an exhaust leak before or maybe shortly after sensor
- the sensor has failed due to:
- age
- physical impact
- heavy carbon deposits
- poisioning:
- lead
- silicone
- weird fuels and additives like octane booster

the switching pattern of your o2 sensor (graph the voltage) can be quite revealing regarding whether the sensor is okay or not