remove the power steering pump pulley and its there its only a 20 min job and a 40$
My guess is its the interupter magnet inside the timing cover on the cam gear
For that things get more time consuming and expensive

remove all the stuff down to the cover and pull the front cover and bam
is right there
best bet would be to find out for sure Or just tear it down and replace the interupter the cam sensor and the crank sensor and might aswell toss a new timing set in it while your at it