Re: HELP!! P1456 90 EVAP Emission Control System Leak Detected
It means that your fuel tank isn't airtight. It could be a crack in the filler pipe, a loose hose or even a blown gasket at the fuel gauge sender.
Your car does a vacuum check on the fuel system now and then. If it detects it's not air tight, it throws a code. Now, the gas cap is the most common thing. But from the fuel filter to the filler neck something is not right. Look for a small gas leak, stick your head under the car and give it a whiff. see if you smell it, if you have a garage put sheets of news paper under your car over night and see if any leeks drip on it. There’s other things but try those first.