I have the following OBDii codes...
 

P1130
P1131
P1405

Can anyone please offer up any suggestions of what they mean and how to fix?

RE: I have the following OBDii codes...
 

P1130 - Lack of HO2S-11 Switch, Fuel Trim at Limit Meaning - The HEGO Sensor is monitored for switching. The test fails when the HO2S fails to switch due to circuit or fuel at or exceeding a calibrated limit.P1131 - Lack of HO2S-11 Switch, Sensor Indicates Lean Meaning - A HEGO sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time

P1405-Differential Pressure [/b]Feedback Electronic (DPFE) sensor upstream hose off [/b]or plugged - or cracked
Have you changed your throttle body or chipped the car lately??

RE: I have the following OBDii codes...
 

Nope, Ive neither chipped or changed the TB. Maybe its just an old clugged hose??

As for the o2 sensors, I should just replace all 4 of them? These issues are really killing my mpg!!