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Even more confused as closed loop means to USE the O2 sensor to close the loop. I.e. the ECU checks the O2 sensor, checks the percentage against the programmed figures for those revs and throttle opening and adjusts the mixture, when it then checks to O2 sensor ....... therefore a loop?
Open loop means set the amount of fuel for the programmed throttle and revs and don't check anything to adjust it.
Anyway this is my understanding? I am prepared to be corrected.
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