On the 2003 Nissan 350z, the P0183 is a straight forward code pointing to a fault with the Fuel Temp Sensor. On this vehicle, the temp sensor is part of the Fuel Pump Assembly. When faulty, the Pump Assembly will need to be replaced as a unit. There is an access panel in the luggage compartment to access the pump assembly. Carefully inspect the electrical connector and as far up the harness as you can, looking for any loose, broken or damaged wires. If the visual inspection checks ok, the Fuel Pump Assembly will need to be replaced.
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