COMBINE sour cream, mayonnaise, cilantro and 2 tablespoons seasoning mix in small bowl.
COMBINE cod, vegetable oil, lemon juice and remaining seasoning mix in medium bowl; pour into large skillet. Cook, stirring constantly, over medium-high heat for 4 to 5 minutes or until fish flakes easily when tested with fork.
FILL taco shells with fish mixture. Top with cabbage, tomato and sour cream mixture, lime juice and taco sauce.