When gas powered cars get older the catalytic converter, or converters if you have a V style engine, can lose their efficiency and set off a CEL, or check engine light. P0420 is a code for a failing ...
The other sensors aren't there as spares - it's not a matter of using a backup one. In general, there would be a sensor for each exhaust manifold (so 1 for a straight 4 cylinder engine, 2 for V6 etc) ...
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