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Engine code help

p0301 - Misfire on cylinder 1
P0003 - Misread in the Fuel Volume sensor (could be a short, corrosion, or fuel regulator going bad)
P03AA - Pressure low on Cylinder 3 aka misfire
The last one I have no idea, but based on a misfire code I got on a bad spark plug on Cylinder 2 I got other codes that appeared separate but were actually sensors freaking out because of the misfire
 
So a little update, I had done a firmware update on the JB4 and the codes have since disappeared along with the car driving well again, I had brought it to the dealer and they said maybe bad gas
 
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So a little update, I had done a firmware update on the JB4 and the codes have since disappeared along with the car driving well again, I had brought it to the dealer and they said maybe bad gas
Where you able to fix all the codes? Or did the dealership fixed it all under warranty?
 
Im at 84kmiles and mines have been throwing misfire cylinder 1 and engine shakes. Ive changed the plugs back to oem and new coil for cylinder 1 and even change the fuel injector and still throwing the code and engine still shakes.
 
Kia Stinger
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