Did you disconnect the sensors before you used the impact tool? If not, they're probably ruined now. I've heard that the vibrations or whatever from power/impact tools will ruin the sensors.
Try replacing them and clearing the codes, and then see if they come back.
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Current Ride: 2012 Nissan 370Z NISMO #0389
Mods: Fast Intentions Resonated Test Pipes and TDX Exhaust with 18" Resonators (#1054), K&N Drop-Ins, GTR Start Button
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