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There are basically only 2 ways a foul sewer odor can get into your kitchen. Either from a fixture drain that isn't trapped or the trap has dried out or from a broken drain vent or a trap that isn't vented properly. If a trap isn't vented then the trap can siphon out which allows the sewer odor into the house. A dishwasher pumps out water under pressure making the trap more likely to siphon out if it isn't vented properly.