4A-GZE MK1 Engine Check Engine Light

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I got a check engine light today. After checking the code it was 52? Knock sensor? The next time I drove my car the light had gone off, but it only took a little while before the check engine light came back. So my question is this... Is it possible there is just a loose connection? If I need a new sensor are they interchangeable between 4AGE and 4AGZE (or any other Toyota engine for that matter)? I