P1250 code

I have a '98 626 ES. I'm getting a few error codes when I run my code reader. P400, which I know is most like cured by cleaning the throttle body and the EGR ports in the I M. The next code I want to get ideas on likely issues is the P1250 fuel pressure regulator control solenoid. What are the typical causes of this code and where should i look first? Your advice is greatly appreciated.
 
I'm also looking for info on codes P1650 (power steering pressure switch out of self test range) and P1780 (transmission control switch (o/d cancel) circuit out of self test range.) Does anyone come on here anymore?
 
Bump. Does anyone work on 626's anymore? Djdevon3? I've seen many of your videos on YouTube. Do you have any input on these codes and the likely causes?
 
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