On Mar 12, 1:50 pm, nccft > wrote:
> Automobile: 2001 Nissan Sentra
> Problem:
> While driving the car after a gasoline full-up the "Service Engine
> Soon" light came on, and would not shut off. I checked that the gas
> cap was tight and let the tank run down, and filled up again. Same
> problem. Brought the car into my mechanic who read the code--P0464. He
> replaced the 'Gas Tank Sender' and 'O-Ring.' However, the problem
> still exists. The car needs an inspection, and will not pass with the
> above condition.
>
> Does anybody have any idea what's going on? Please Help!
>
> Larry

They need to verify the sender is sending the correct voltage to the
ecm. As long as the sender is working and there is no wiring issue,
the ecm is at fault.