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Thanks for using JustAnswer, my name is ***** ***** I have been an automotive technician for over 12 years now. And I am currently working at a Toyota Dealership.
I can see how you can be concerned about something being tampered with especially when the light has come on recently after a repair. But I really dont think that this might have happened. The code indicates that there is a lean condition(too much air, and not enough fuel) entering the engine. There is a common problem with this vehicle where the boot that connects the air cleaner box to the throttle body tends to crack and leak. This then allows unmetered air to enter the engine that the ECM is not aware of causing this lean.
Also the P1157 code also indicates that the 02 sensor is "stuck" in a lean condition. This is may be casued from the same vacuum leak.
I would start by inspecting this boot for cracks.
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