2002 Nissan maxiam code p0011 timing and low oil pressure?

Ok guys or gals car has that rock/gravel
sound passenger side of engine. In 2004
a recall on cam sensor was replaced.
Been making very low grade sound for
long time maybe 8 months off and
on...then go away. someone said timing
belt. So before I could get it checked
started making noise kinda loud then oil
light flash when very low rpms. It has a
chain come to find out, not driving it but
only around corner to store I'm afraid to
go far! I've been doing a lot of reading I
was told it could just be the sensor on
that bank one changing it could solve
problem is that true?? I can change That
no problem but not the chain tensioner
and guide I will get help on that. Really
wanted to know about perhap just
changing sensor?? Can runs soooo good
not had any problems at all except
powersteering hose. Can I get some help
please thank you.