Impreza RS Coupe AWD F4-2.5L SOHC (1999)
4. Install crankshaft sprocket.
5. Install camshaft sprocket No. 1. To lock camshaft, use ST.
ST 499207400 CAMSHAFT SPROCKET WRENCH
6. Install camshaft sprocket No. 2. To lock camshaft, use ST.
ST 499207100 CAMSHAFT SPROCKET WRENCH
CAUTION: Do not confuse left and right side camshaft sprockets during installation. The camshaft sprocket No. 2 is identified by a
projection used to monitor camshaft position sensor.