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So what is the O2 sensor's purpose? (archive)
[ Follow Ups ] [ 5-series (E28) Message Board ] [ Msg. Board FAQ ]
Posted by Jamie on December 23, 2001 at 20:57:27:

Is it for emission control or fuel efficiency? What happens when it is disconnected--does the engine run alright? If it was malfunctioning, could it account for a loss of fuel efficiency of 5-7mpg as in my 84 528e?

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