Do I understand right that a lean mixture (O2 Lambda Sensor < 0.45 Volt) represents low fuel and high oxygen level and that results in complete burning of all fuel and low CO and HC on emission test?
Another word, can I change a mixture to lean via regulator on the air filter to pass an emission test? I understand that a car will lose in power because of a lean mixture but will it reduce CO and HC in exhaust?
Txs.

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1987 MB260E 187K