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On my 2004 XC90 the lens covering the position light swings open left to right. The bulb is easily accessible.
Not sure what you mean about "front position light" however most of the time your owner's manual will address these repairs. See sources and related links below for 2004 Volvo XC90 bulb information.
The position light cover pops out or rather swings out, after you gently insert a small screwdriver into the slot and give a pry. Easy.
yes
The 2011 Volvo XC90 has 24 valves.
The 2012 Volvo XC90 has 24 valves.
The 2013 Volvo XC90 has 24 valves.
The 2007 Volvo XC90 has 24 valves.
The 2014 Volvo XC90 has 24 valves.
The 2008 Volvo XC90 has 24 valves.
The 2005 Volvo XC90 has 20 valves.
The 2009 Volvo XC90 has 24 valves.