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At first glance you might think the AX4S and AX4N turbine speed sensors are the same. However, a closer look will show you that the AX4S sensor is a little longer – which means the wrong sensor could easily be installed in the wrong unit by mistake.
If you’re not sure if you have an AX4S or AX4N driven sprocket, measure the air gap before you assemble the unit. The correct air gap between the turbine speed sensor and the reluctor is approximately .120 inches.
If you think you might have the wrong combination of parts and the unit is already assembled, check by measuring the depth of the turbine speed sensor hole to the reluctor. If your measurement is .687 to .709 inches, you need the AX4N sensor F5DZ-7M101-A. If your measurement is .759 to .772 inches, you need the AX4S sensor F1DZ-7M101-A.
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