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A bad knock sensor won't give you startup problems. Hell, you can have it totally disconnected and the engine will still start up and run fine. Altimas are notorious for problematic knock sensors. Maybe it was a bad batch or an engineering flaw somewhere. It is the one item that is almost guaranteed to go bad in an Altima. It won't turn on the Check Engine light but a code 34 will get stored inside the ECU.
The knock sensor actually goes bad with temperature. Seems like the piezoelectric crystal inside the sensor distorts with heat and causes the electrical connection to the outside terminals to disconnect.
The most you can hope for is a loose or disconnected knock sensor wiring. Otherwise, there is nothing you can do but replace it.
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