f250 Code Problem
 

Hello,
Hope someone can help me out.

2006 F250 4x4 , 5.4l gas King Ranch 94,000 miles. Have replaced both Cam positioning sensors & reset it. After only 5 minutes the engine light will come back on. Hook scanner back up & it reads P0340 (cam position sensor) again. What's the next step. Having a mechanic look at it I'm guessing? No other problems. Just had oil changed & one of the sensors changed at the local Ford placed last week because the light was on. Two days later the light comes back on so I changed the other. Light came back on again the same day.

Ronnie