Actually, they combine the oxygen with the hydrocarbons, producing CO2
and H2O, but they measure the oxygen content in the exhaust, hence the
name 'Oxygen Sensor'. :-)
Gene Beaird
98 Flame Red CC R/T
95 DGGM Impala SS
>>REMOVE oxygen from the exhaust, which is what the sensor is looking for. The
>>downstream sensor therefore expects to see LESS oxygen.
>
> That I DIDN'T know. The cat removes oxygen? I figured that oxygen
>was OK, so a cat would let it by, while trapping the hydrocarbons (or
>whatever)
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