Hi,

I just picked up a 2005 F150 FX4 5.4L with 100k miles on it. Trucks in amazing shape, runs really well, but when I picked it up it had an engine code. We drove it around and the code disappeared, the code has now showed up again. I read some terrible things that it could be the phaser, the oil pump, VTC, cam skipping a tooth, etc... The engine runs so smooth that if it skipping a tooth I'd be surprised. How to diagnose.

I'm getting both p0345 and p0349 codes when the CEL is on.

 

P0345 Camshaft Position Sensor A Circuit Malfunction (Bank 2) A code P0345 could mean one or more of the following has happened:

a wire or connector in the circuit could be grounded/shorted/broken
the camshaft position sensor may have failed
the PCM may have failed
there exists an open circuit
the crankshaft position sensor may have failed
Visually inspect all the wiring and connectors in the circuit
Check for continuity in the circuit wiring
Check the operation (voltage) of the camshaft position sensor
Replace the camshaft position sensor as required
Check the crankshaft position circuit as well
Replace circuit wiring and/or connectors as required
Diagnose/replace the PCM as required

Also check the altenator's charging diodes an electrical motor repair shop can do this....sometimes when one of the three diodes starts to fail the camshaft position sensor code gets triggered....

Since the p0349 is also showing I would really check the wiring harness/connections first over anything else...

 

Found the problem was actually the previous owners botch job.... the connector was messed up and the wiring was done wrong. Soldered it put it back no problems!!!