Code P0394 - Camshaft Position Sensor Bank 2

[david.bell.9678]

Need some help please on a 2012 Expedition XLT 4wd - 203,000 miles

I bought this used at 24,000 miles and i believe this is the first code it has thrown since I have owned it. I replaced the camshaft position sensor and the light went off for a period of time. It seems to drive OK, meaning no engine hesitation, sputtering, etc.

After 3 - 4 days the Check Engine Light came back on and I had the code scanned again - same code again - P0394.

Here are my thoughts -
Bad sensor out of the box - doubtful
Over voltage [voltage spike] that is burning up the sensor
An intermittent wire problem, likely a worn or broken wire.

The guy at the auto parts store that did the scanning told me I could check for voltage using a multimeter, turn the key all the way on without starting the engine, and then check voltage on the connector. I did this but could not get any voltage to show. I did this on both Bank 1 and Bank 2 sensors. Same result for both, no voltage showing. Since the the Bank 1 sensor should be good, I assume I did something wrong.

Any ideas on how to proceed from here? Also what is my risk if I cannot get this resolved? Is engine damage a possibility?

I appreciate any and all thoughts/comments. I love this Expy and hope to put another 100K + on it.

Thanks,
Dave.

 

[1955moose]

The fact that the check engine light went off, and all was good for a few days tells me all is good with power, ground etc. Theirs probably a different way of testing, that your not doing. I'm going out on a limb here, and say replace the sensor, but with a Ford one, not a cheaper auto parts store one. And check the plug for corrosion, or loose wire. I like using a small bit of dielectric grease on all connections. Seems to help with connectivity in my situations. Try it, and let us know.

Sent from my N9131 using Tapatalk

 

[Habbibie]

Usually it's the phasersthat cause the cam shaft light to come on after replacing them, it's not too expensive of a job if all you need is the phasers which I'm gonna assume that's all that is needed. At 200k+ I'm surprised they lasted that long to begin with... gonna estimate total repair cost at ball park $800 phasers included