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These are two of the 02 sensors   available. The   sensor on top uses   a single wire and   is for applications where the sensor   is within a few   inches of the exhaust manifold. The heated three-wire sensor (bottom) can be used farther from the exhaust port.
Easy EFI, Part 1

These are two of the 02 sensors available. The sensor on top uses a single wire and is for applications where the sensor is within a few inches of the exhaust manifold. The heated three-wire sensor (bottom) can be used farther from the exhaust port.  View Related Article

 

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