The number of bolts securing the sensing ring to the crankshaft has been reduced from four to three on 4B1-equipped 2008-2011 Outlander, Lancer, Lancer Sportback, Lancer Evolution and 2011 Outlander Sport.

This change took place beginning Oct. 4, 2011, with engine serial # GR1742.

The sensing ring still features four bolt holes, but the crank only has three bolt holes.

The sensing ring still features four bolt holes, but the crank only has three bolt holes.

The bolt hole was eliminated in the crankshaft, but not in the sensing ring.

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