Auto focus do not work

SOURCE: Nikon D40X stopped auto-focusing yesterday

I too have the same auto focus issue. But the problem is intermittent.
Called Nikon today. They suggest:
- call when the camera is acting up
- be ready to give them the serial number

Apparently they are available 24 x 7 and will troubleshoot over the phone...

SOURCE: Nikon D80 Autofocus problem

sir, replace ur lens image reading sensor

SOURCE: Nikon 18-200 autofocus lens won't

OK I just fixed it, thanks to Ken Rockwell.com who says:

"Once in a blue moon my Nikon 18-200mm won't focus on my D200. Manual focus works fine, but the lens won't autofocus no matter what I do. It's annoying!
Of course the camera needs to be pointed at something with contrast, lines or texture. Point it at the sky and nothing autofocuses. That's normal.
One time this was so bad I thought for sure I was going to have to send my lens in for service, since nothing would get it to go.
Then I discovered the problem: I had knocked the AF switch on my D200 to M. This switch is easy to knock and I had forgotten to check the obvious. There also is a switch on the lens which is not easy to knock, but I have left the lens set to M shooting at night, and I forgot to return it to A/M the next morning.
This fixes most of my problems.
Rarer is when the lens honestly won't focus. When this happens I turn the camera off and on. If this doesn't fix it, turn the camera off, press the lens release button and rotate the lens back and fourth a couple of times. This will clear any dust off the electrical contacts and focus returns."

SOURCE: nikon 18-200 mm vr lens not auto focusing on my nikon d200

lets start with the basics, try hard reseting it and try again, if that doesnt work then
try upgrading your firmware (if possible on your camera) and if that doesnt work then it may be the lens, but dont forget to spend a few hours trying to find a option for it in the meny

SOURCE: Nikon d40 18-55mm lens will not auto focus.

the nikkor 18-55 lence is no longer u can chage the ed lence into vr lence is upcomming with nikon d3000 mout the coast of the lens is 200$