It means that something is faulty in the emissions control , have the vehicle scanned by a reputable tech
Ignore it! like most problem with my passat unless if you are taking the emission test. If you want to make it go away simply unplug battery for about a day or overnight then plug it back in. If you don't know the radio code drive the car for minutes it'll appear back on. Barrow the scan tool and erase it.
Cause could also be a fuel leak, loose gas cap, incorrect or change in grade of fuel, sensor pick up smoke/fuel order in surrounding ( outside or fuel spill) such as if you go to a gas station.
Keep fire extinguisher handy in trunk just in case if m wrong. ;-)
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