I have a 2007 G35 sport sedan with ICC. It has only sensed a vehicle ahead once while a big, white, truck with lots of reflector strips was in front of me. I need help diagnosing the issue or perhaps upgrading the sensor but I can find almost no posts on the subject. Has anyone else had issues with ICC? What was done to try and fix it? Did the fix work? Any help is appreciated!

Never had any issues with mine other than the wife calling and saying there was an issue with the car slowing down when CC was on... ...she was a bit embarrassed when I explained it to her.

Make sure the lens is clean and there is no real damage. The owners manual has information in it concerning ICC as well. If it is still not functioning properly then I'd get it checked out by Infiniti if it's something you use often. Alternatively you can go through the FSM to go through troubleshooting steps...

http://www.nicoclub.com/FSM/G35/Sedan/2007_G35_Sedan/

Thanks for the service manual link, I'm sure that will come in handy to me soon. Unfortunately I think I lost the clutch slave cylinder last night so I just had it towed to the Infinity dealer for service Monday. I will ask them to look at the ICC while they have the car and let you know what they say.

Yeah, let us know what they find out. Good luck, hopefully the cost won't break you.