Kia sedona code p0088 how to fix - Sedona Kia Cars & Trucks

U can check the corresponding error on ur manual of sedona , coz this is an error code. and i think ur fuel pressure pump is at fault.

On the 99 Kia Sephia 1.8L, on the fuel rail under the hood, there is what looks like a service port. It kinda looks like a valve that you would fill a bicycle tire up with air, it also might have a light ble cap on it. press in the pin like you would let the air out of a tire. (CAUTION) use gloves and eye protection cause this part of the fuel system is pressurized. Some fuel will squirt out but will evaporate soon, faster on a hot day. Hold pin untill fuel doesn't squirt anymore. (NOTE) Before starting your car next time, cycle the fuel pump by turning your key to the on position a couple of times.

This is just a solution for a 99 kia sophia. It may be the same.

Hope it helps

Have a fuel pressure check done. The code is fuel pressure to high. The fuel pressure is controlled by the fuel pressure sensor or a fuel pressure regulator. Not knowing the yaer or engine size, it could be one or both.
Randy