Turns out however, that on this Mustang, I cannot swap O2 sensors side to side. The 2 sides have connectors that are keyed differently and won't allow swapping. I may still try swapping the injectors side to side if nothing else cures the issue.
I noticed the last time the P1151 was set, it occurred after a barely detectable stumble in the engine after shifting into 3rd gear under light throttle.
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