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Chances are its in limp mode which is the computer's way of letting you drive it to a repair shop or back home.
Code 1684 just means the computer has lost battery power at some point in time. That won't tell you what the problem is now.
So a transmission shop may be your best option.
Code 1684 says the computer has lost battery voltage in the last 50 starts, and code 1685 means the security code in the key is not valid. You may have to have the computer flashed by the dealer to match the original settings in the original computer.
The first code, p1684, just states the battery has been dis-connected in the last 50 start cycles.
Code p0401 is the EGR flow. You may need to replace the EGR valve.
Code p1193 is the intake air temperauture ( IAT) sensor. It may also need to be replaced.
Have your mechanic take a look at those, and please let me know how it goes.
Did you use the correct brake fluid? Did you put custom wheels on your car? Do you have a leak in the brake line? Make sure that the brake boost hose is attached to the air-intake on the top of the engine to the left side. This is a black rubber hose. May be one or more calipers are sticking unnoticed to your braking. check you master cylinder to see if it is working.
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