Code p0402 checked all vacum hoses & hoses at cardbon cotainer

Hi Pamela,here's a link to your code. P0402 OBD II Trouble Code

Code 402 means the computer has detected flow in the EGR valve when it should be closed.
The valve would need to be checked out.

There is no P0402 listen in factory service repair manual for this vehicle . Your best bet , take it to a buick dealer . Some after market scanners pull wrong code's ,take it to where they have factory tool an have genuine gm parts! A P0402 in older vehicles was for a EGR system problem ! Your vehicle does not have an EGR valve . Has a Camshaft Actuator System

code 34 means you are not getting any egr flow. find your egr valve and check to see if vacume hose is attached, if so follow the hose to the egr solenoid which should have that hose and a direct vac hose going to it. and an electrical connector. make sure all of these things are in place and not disconected or broken. the most likely cause is either a broken vacume hose or a clogged intake manifold.

First make sure all lines are connected to EGR , if not ,connect them if they are? Then remove EGR value and clean and reconnect.

I think you have a vacum problem. Check the vacum hose that, I think starts at the rear of the intake manafold
that hose will pass through the fire wall. Check to be sure
that the hose is not split or BENT stopping the vacumn
from getting to the A/C & Heater system.
Part of the job of that hose is to open & close the vents
air direction.

i know it sounds reduntant but now you need 2 return to autozone and have it rescaned and old codes cleared

If you need further help, I’m available over the phone at https://www.6ya.com/expert/michael_00678fd4800d19c5

most likely all is not neccesary, sounds like they dont know what the prob. is so they want to replace every thing... i would try another garage

did you replace the egr valve

most of the time i see this code you want to check the vacume switching valve for the egr ,i hardly see it where the egr is the issue you may want a mechanic to check this you can check it yourself but you would need toyota diagnostic specific info where you would need to apply voltage to the sensor and check the operation of the valve restricting or letting air flow hope this helps