It's a recall, dealer will do it for free.
It is located on the backside of the engine. Go to youtube and type in how to replace camshaft sensor on 2005 Nissan altima and it will show where it is and how to replace it, that is how I did my one.
Here are some good illustrations/instructions. http://www.nissanhelp.com/diy/altima/projects/nissan_altima_in_cabin_filter_replacement_procedure.htm
how do you replace the ac evaportator
The camshaft position sensor is located near the thermostat housing. You should replace the crankshaft position sensor as well. This one is much harder to locate....it is on the backside of the engine that is between the firewall and the engine block. Both use the same sensor.
I don't believe that the altima had a crankshaft position sensor until 1995.
it is bolted to the side of the throttle body located where the intake tube connects to the motor
how to replace an altinator in a 2005 nissan altima
How do you replace rear shocks on a 2003 altima?
go to back of headlight assembly and twist it out.
The EGR valve in a 1997 Nissan Altima is located at the top of the motor in a position near the firewall. The EGR valve is held in place by a vacuum line and 2 nuts.
How do you replace a water pump on a 98 nissan altima?
You will need at least $300 to replace a radiator in Nissan Altima.