P1800 2005 Nissan Altima Sedan -

Question

Put shell premium gasoline in the tank and 15 minutes later two codes got thrown. P0507 and P1800

Answer 1

P0507 Nissan - Idle Control System RPM Higher Than Expected

you can try to clean the throttle body and see if it makes a difference. you will have to do an idle air relearn after cleaning the throttle 

http://nissanhelp.com/diy/altima/projects/nissan_altima_idle_air_volume_learning.php

Possible causes

- Dirty throttle body

- Electric throttle control actuator misadjusted or damaged

- Faulty Electric throttle control actuator

- Intake air leak

- Poor electrical connection to the Intake Air Control (IAC) valve

 

 

P1800 2005 Nissan Altima Sedan - Variable Intake Air System Control Solenoid Valve Circuit

you can check to see if there are any broken hoses first.

Possible causes

- Faulty VIAS control solenoid valve

- VIAS control solenoid valve circuit harness is open or shorted

- VIAS control solenoid valve circuit poor electrical connection

https://www.autocodes.com/p1800_2005_nissan_altima_sedan.html