Wash and chop tomatoes and cilantro. Cut cod into 1-inch pieces.
In a small bowl, combine sour cream, mayonnaise, cilantro and 2 tablespoons taco seasoning. Set aside.
Warm tortillas in a small skillet without oil over medium heat, about 30 seconds per side. Remove and cover with a towel until ready to fill.
In a medium bowl, combine cod, olive oil, lemon juice and remaining taco seasoning mix; pour into large skillet.
Cook, stirring constantly over medium-high heat for 4-5 minutes or until cod flakes easily when tested with a fork.
Fill warm tortillas with fish mixture.
Top with cabbage, tomato, sour cream mixture and lime wedges.