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How Many O2 Sensors On Sc400?


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I was just wondering how many o2 (oxygen sensors) are on the sc400? What are the locations?

I believe there are 4...2 aft of the forward cats and (this is the part I'm not 100% sure of) 2 on the engine. As I understand it, the ECU collects data from the O2 sensor(s?) on the engine and the 2 aft of the cats to determine how the engine's running and adjusts accordingly. I would assume the primary O2(s?) are near the ECU or can be traced via connections.

I hope this helps, probably not. :chairshot:

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