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The frequency is the radio channel the sensors talk on. It has to match your car's receiver.
The 'secret code' is just the identifier, the radio handle of the sensor.
"Hi, I'm sensor xbd8348 and I'm reading 32psi!" That's all.
There's no reason for a kid to be messing with the sensors. From 5 minutes on the internet, it looks like there are two ways to teach the car about the new sensors. One involves a tool. The other doesn't. So do that.
Make sure the tires are at the right pressure.
Make sure there are no other tires nearby on the same frequency (Your wife's car).
Drive the car more than 10 minutes at a speed above 25mph.
Park the car 15 minutes, at least 10 feet away from any other sensors.
The article I read recommended no blue tooth or wifi sources during the learning procedure, so leave your phone at home or turn it off.
My Jetta had tpms through the abs sensors. You'd set the tire pressure on all 4, then start the car and drive it a bit. There's a reset button inside the glovebox, you'd press it and wait for the beep. That was it. It didn't know the pressures, it just knew when driving down the road at 25mph, the left front was usually at 400rpm, the right front was 402, left rear was 400 and the right rear was 398. Just making up the numbers. If one of the wheels rotated faster or slower than the others for a certain amount of time, it would light the light. No magic there.
Fun fact. If you don't check the tire pressure for a very long time and they all leak down equally, it won't light the light. I checked it one day before a trip and they were all about 22psi.
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