O2 sensor

how does a engine act if the O2 sensor is bad[img]/phpBB/images/smiles/icon_confused.gif[/img]
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Fuel consumption will go up a lot.

The O2 sensor's output is about 0.8 V when rich and 0.1 when lean. The ECU tries to keep the value in between by adjusting the fuel flow. When it's broken, the sensor will give a low voltage (I suspect) all the time, so the ECU thinks the engine runs lean and tries to enrich the mixture.

we pluged it in to a engine anaylzer and everything seemed to check out ok(no codes) but the O2 sensor read rich
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I had a sensor go out on my jeep after a head rebuild. I took it into my favorite shop and he instantly knew it was bad just by looking at it.

It had a telltale light grey-kinda-powder-like coating all over the electrode. He said it was from silicone contamination, most likely from RTV on the new intake gaskets.

hoeing out the converter helped a whole bunch.It had two but now has one(empty)OH YA this is on a 94 xplorer 4.0

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