I have been getting a 4WD Solenoid Code on my G35X. Upon showing it to a mechanic he told me that the sensor in the Transfer case is leaking and that the sensor comes with the seal. Is this true? The AWD light stays on the when the car is cold started for the first time in the morning and then after that its not there. Thanks!

The Code is C1204 along with C1210.

 

Check out this thread, sounds a lot like the problem you're experiencing

https://g35driver.com/forums/g35-sedan-v35-2003-06/451289-transfercase-removal-awd-light-c1204-c1210-codes.html