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I think what mike was getting at is that ecu only reads from a single 02 sensor
So if that sensor is reading a combination of all four cylinders like in stock position then its going to read the average afr of all cylinders so you would not rearly know if one cyliner was rich or one lean.
If you put it in one runner then you only get an accurate reading on one cylinder but dont know what ghe otjers are doing.
The best option would be four 02 sensors one per cylinder.
Also the standard ecu setup only uses 02 sensor as fueling refernece when cruising and light throttle.
In full throttle or hard acceleration fueling is based of maf sensor and fueling tables the 02 sensor is no longer in feedback loop.
In either case of one runner or combined location if you get a single cylinder injector go bad its not going to save you. The fuel trims will take ages to set a cel code even if it was the single runner monitored, even then it doent shut down engine
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