Hello Day, and welcome,
P0200 is an injector control circuit malfunction, and can be traced to a few things. You have not added if the code is an H or a C. I need to know which it is.
Then, a few questions, forst, is the engine idling a little rougher than normal? Next, at anytime did the SES light flash once per second??
This code is basically telling you that either the PCM cannot see correct voltage to the injector control circuit, or the grounding path is not correct.
Please answer these questions, and I can proceed. This code is not a cylinder specific, like a misfire, so I will need these questions answered.
Dont worry, we can handle this, best to ya, and welcome once again, c4c5