What's the warranty for emissions and SRS parts?

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My SRS and check engine lights keep coming on. I reset the SRS light but it will come back on a few weeks later. The check engine light goes on and off every few days. SRS code is 7-2 "Internal failure of SRS unit". Engine light code is P0420: Catalyst efficiency below threshold bank 1, which might be the catalytic converter or pre-cat. I've heard rumors that both of these might be covered by warranties. Is that true? I'm not the original buyer of the car. Not sure if that matters.