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2019 Kia Sedona
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I just bought a brand-new, 2019 Kia Sedona. Within a few weeks (about 400 miles on the car total), the check engine light came on for an evap leak. Took it to the dealership and they were not worried, said it's extremely common and probably due to "air in the tank" from the last time I filled up. They tightened the gas cap and cleared the light. One day later, the light is back on. So, what should I do? I don't really want to keep scheduling appointments at the dealership if they are just going to clear the light and say there's no problem. Could the gas cap be faulty? Is the sensor bad? Is there actually a leak in a car with 400 miles on it? My plan was to finish off this tank of gas, fill up at a different station and see if the light goes off. Any other suggestions? This is pretty annoying with a brand-new vehicle.
 

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I just bought a brand-new, 2019 Kia Sedona. Within a few weeks (about 400 miles on the car total), the check engine light came on for an evap leak. Took it to the dealership and they were not worried, said it's extremely common and probably due to "air in the tank" from the last time I filled up. They tightened the gas cap and cleared the light. One day later, the light is back on. So, what should I do? I don't really want to keep scheduling appointments at the dealership if they are just going to clear the light and say there's no problem. Could the gas cap be faulty? Is the sensor bad? Is there actually a leak in a car with 400 miles on it? My plan was to finish off this tank of gas, fill up at a different station and see if the light goes off. Any other suggestions? This is pretty annoying with a brand-new vehicle.
The Evap code can occasionally be triggered by a loose gas cap, but if its happening repeatedly Kia needs to resolve it.
 
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'15 Kia Sedona SX
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152 Posts
Potential symptoms of an [actual] EVAP Leak
● Trouble starting the engine
● Bad fuel economy
● Rough idling
● Overall drop in engine performance

If not the gas cap, then maybe:
● Faulty O-ring seals
● Defective leak detection pumps
● An inoperative purge valve
● A leaking vacuum hose or vent
● Leaks in the EVAP canister
● Breakage or leakage somewhere else in the system

All of which would be under warranty. The time suck sucks, though.
 

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2019 Kia Sedona
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Discussion Starter #4
As an update, I went back to the dealership and the light literally went off for the first time when I pulled in. Mechanic blamed "bad gas", whatever that means. I let the fuel tank completely empty and I haven't seen the light on since.
 

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'15 Kia Sedona SX
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I didn't believe in "bad gas" -- at least since the legislation of federal standards -- until last week. Sometimes it's not the gas per se or the gas that was loaded from a tanker into the underground tanks.

My el-cheapo neighbor fuels his wicked 'spensive 'n complicated German turbo motor with local "Neighborhood Gas," which has apparently been there forever. However it happened (underground leaks, broken pipes, who knows?) he got some "bad gas": In this case, gas + some kind of oil (likely diesel, IMO). Big headache (I mean: Really Big, like as in 'spensive 'n complicated German turbo big), and good luck proving it was his friendly "Neighborhood Gas" gas station...

Against my nature, I try to stick with GDI-recommended top tier (typically using the "Fuel Rewards" program to get discounts off of Shell gasoline). Otherwise, I'm fueling at the super-cheap (but still corporate-y), local BJ's or Slop & Shop (neither of which is "certified" top tier, but who knows?). Wish I were near a Costco: I hear they dispense top-tier gas at Costco-tier prices.
 

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I'm always avoiding the cheap places and will try to go to same brands and if I change, unless roadtripping, I try to stick to one brand. I figure if the additive package differs, it would help to not mix them.

When In the US, I use a bit of Gut Feel because some names appear as cheap in my mind, but are actually rated top tier. Anyway, I burn it all up pretty soon and use canadian brands the week after.

Never had symp^toms of bad gas, too, but as I said, I tend to avoid places that look too old or badly maintained. My worst experience at a Gas station was at a BP that seemingly was totally empty, It took me a couple minutes to get less than a gallon, until I was totally frustrated and went to another close one which had plenty of gas (It happened somewhere in georgia or florida). The pumps at that BP looked old like it should have been bankrupt already. I bet the gas wasnt good too, but I put a full tank over it so it got dilluted in a pool of good stuff soon after...
 
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