what does code P1800 and P1102 mean for 02 nissan altima?

Question

Before I take it to the mechanic it did not have much power and the gas was not supplied constantly. What do these codes mean and could be the source of the gas issue and power?

Answer 1

P1102 Mass Air Flow Sensor Circuit Range/Performance

It is related to the mass air flow sensor, the sensor can be removed and cleaned with mass air flow sensor cleaner.

 

P1800 Variable Intake Air System Control Solenoid Valve Circuit 

Valve most likely needs to be replaced.