The code B1229 is found for the error of engine of car and this error code is about Exhaust Gas Recirculation Sensor B Circuit High. When you want to fix the problem, then you may need to use manual of the engine and car. The reason of the appearing the error can be different vehicle to vehicle. You may need to change the sensor of the engine and replacement cost can be between $200-$300 what depend on the car. The B1229 code on vehicles with electronically controlled automatic transmissions. I think, you can solve the problem from the engine and you have nothing to worry.