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Are you seeing fluctuations under both closed loop and open loop operation? Ex. Does the Commanded AFR not follow the targeted AFR consistently under full throttle? If it runs fine and you are not seeing changes in you fuel consumption, its probably not a big deal. But if you messed up the threads on the O2 sensor and there is a leak, then you should address that.
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Intent > Content
cowardice is the mother of cruelty.
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