I have a PT 2010 & the diagnostic codes are PO340, PO344 and PO325. mechanic is suggesting replacing the cam shaft post sensor & didn't even mention the knock sensor. Am I dealing with 1 or 2 issues

P0344 indicates a cam sensor problem. This can be a very tricky code to diagnose. replacing the cam sensor typically does not fix the problem. I would suggest having this properly diagnosed by either the dealer or a reputable independent shop.

If you would like to try replacing the cam sensor it is located on the drivers side of the head just below the valve cover. there should be a couple of bolts holding it onto the head and I believe a three pin connector attached to it.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Well code 344 means the signal coming from cam sensor 1 is failing at times. If you have replaced the sensor, it could be the cam, or the wiring.
You may need the actual factory troubleshooting chart for the code to find the problem.

Has anyone checked the timing? Are the cam and crank sensors I synch? Fuel preassure? Any DTCs(diagnostic trouble codes)? Last time timing belt was replaced?

PO345 is the cam shaft positioning sensor and PO325 is the knock sensor. Check your starter and your battery.

the cam sensor is near the battery. it is on the end of the cylinder head rear. you should have a code po340 if the cam sensor is bad. get someone to scan it before replacing the sensor . check under the car for a wire rubbing on the cv shaft that goes to the crank sensor.

code po 340 no camshaft position sensor signal at powertrain control module and code po344 rationality error detected for intermittent loss of camshaft position sensor circuit. hope this will help you!!!!

po325 knock sensor 1 malfunction po340 camshaft position sensor malfunction po605 internal control modular (rom) read only memory error check the wiring to the computer for proper connection and damage the computer (pcm) may be damaged or its program erased this happens sometimes when the connector is unplugged and the battery is hooked up the other two can be related (pcm) failure or could be a wiring problem po325 check knock sensor wiring and sensor and same for po340 crank sensor wiring and sensor good luck

The po340 is a cam sensor code ,po325 is a crank sensor code>THE crank if it goes bad will through both codes,and also the car will not start.You will have no spark or injector pulse.So have your crank sensor checked:)

My Nissan micro 2004 model just stopped in the middle of the road one day then the engine management light came on, anyway took it to my local garage TWK Thomas who said it was a cam shaft sensor problem. OK so sensor was put on, engine management light went off for two days only. So went back to the garage they said that another sensor should be fitted on the opposite side. And then the problem should be rectified, but i had given the £160 for this problem to be fixed the first time. I decided it was time to take it to another garage Nis Tec they put it on the computer and a code po340 came up would this mean another sensor or the cam chain has stretched please help. ...claire

Take a look at this link http://www.obd-codes.com/p0340.  The problem lies in the cam shaft sensor circuit which means that it isn't necessarily the sensor itself.  Read what that page has to say and just start from the top and work your way down the solutions.  As far as how much it cost, it obviously depends on what is wrong, but assuming it is your cam shaft sensor you can buy the part for around forty dollars at AutoZone.  Let me know if you have any other questions.  Thanks for rating my response and for using FixYa!