When you get B1209 Code from your car engine, then you do not worry. You may solve the problem if you use car manual. The meaning of the code can be different according to the manufacturer and model of the car. The code B1209 EIC Switch-2 Assembly Circuit Failure as you must check ODB-II Engine Error Code list. The firing order is a significant part of the general design of the engine and is strong-minded through the design of the engine to remove as much engine shaking as possible. The firing order for a specific engine is naturally found in the mending manual specific to that model.