If you decide to remove it to replace the gasket/ seal, remove the 2 small bolts on the sensor first to expose the tone ring inside.. You can do one of the following.; turn the crank shaft until you get the timing at top dead center with the #1 cylinder at the compression stroke. The tone ring on the crankshaft sensor housing has a small hole that should line up with a hole on the sensor housing. This is your reference guide. Install a pin or a hex wrench that fits the hole to keep it in place. Before you pull or move the housing, clean around the area where you can mark the housing and the engine block with a white paint line across the two surface as reference during assembly. When your ready to pull the unit out, it will twist on the same direction as the cam shaft gear while pulling straight up. Replace the seal then reinstall the sensor housing with the prior marks lined up accordingly..
The other method is; instead of using thenTDC method, you can remove the sensor then mark the current position of the tone ring straight to the housing, then mark the base of the housing to the engine block and proceed with the removal..