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<blockquote data-quote="wan520i" data-source="post: 301703" data-attributes="member: 1625">I had check with a digital meter to the 12v supply at the sensor connector - 2 white wires, when the engine is cold, warm or hot, there is no 12v VDC present for heater.&nbsp;Also checked the O2 sensor relay, it seems ok to me.&nbsp; There are 4 wires at the relay: Terminal 30 &amp; 86= red/white-12 volts VDC. Terminal 87= green-to O2 sensor. Terminal 85= brown/green-output from DME.&nbsp; &nbsp;I believe terminal 85 is ground wire, but measured with a digital meter found 12volt VDC present there. Just don&#039;t know WHEN is the smart DME will convert it become &quot;Ground&quot;?&nbsp;So far my car idling is fine, but I think my fuel consumption is quite high especially on city drive, is about 0.37 cents per km based on old petrol price, highway is about 0.23 cents per km.</blockquote>

[QUOTE="wan520i, post: 301703, member: 1625"] I had check with a digital meter to the 12v supply at the sensor connector - 2 white wires, when the engine is cold, warm or hot, there is no 12v VDC present for heater. Also checked the O2 sensor relay, it seems ok to me. There are 4 wires at the relay: Terminal 30 & 86= red/white-12 volts VDC. Terminal 87= green-to O2 sensor. Terminal 85= brown/green-output from DME. [COLOR=red]I believe terminal 85 is ground wire, but measured with a digital meter found 12volt VDC present there. Just don't know WHEN is the smart DME will convert it become "Ground"?[/COLOR] So far my car idling is fine, but I think my fuel consumption is quite high especially on city drive, is about 0.37 cents per km based on old petrol price, highway is about 0.23 cents per km. [/QUOTE]

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