Homemade A/F Meter

[Khoo Teck-Khoon]

Wiring of the O2 seems okay, but the problem is the low voltage signal. 
I am getting readings of 0.045 to 0.075 volts, it should be in the 
region of 0-1 volts, right? Could it be that the low voltage is due to 
wrong mounting of the O2 sensor? I have found that the tip os my O2 
sensor is barely 1/4 of the distance to the centre of the exhaust 
piping.

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