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) ...
Don't let failing oxygen sensors compromise your engine's performance. O2 sensors are critical to emissions control on your car, SUV or truck. As the name implies, the O2 sensor (also called an ...
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