CO regulator (potentiometer), typically a variable resistor that regulates carbon monoxide (CO) emissions from vehicles running on leaded fuel. On such vehicles, the CO regulator is installed in place of the oxygen sensor to control the pulse width of the fuel injector.
[Information taken from the official website ChevyMan]
CO regulator (leaded fuel only) (Chevrolet Aveo T250)
The article was checked: Vladimir Romannikov
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