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Old 09-05-2007, 11:48 PM
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Hey guys. Was driving Milly around tonight for the first time in a about a week. I had to give up on trying to find a fix because school started now, but now I really need some helpful info on what to do.

Last week I threw a P1250 code "Pressure Regulator Control Solenoid Circuit Fault"...started to diagnose it but had to put it all back together and in the garage since I ran out of time.

Drove the car around this afternoon and tonight with no problems until the CEL popped on again.

I got P1250, and the P0421 (Warm up catalyst efficiency below threshold)...I don't really care about the P0421 code right now.

I'm concerned about the P1250 code because I can smell electrical arcing (welding smell) in the cabin and under the hood. I'm hoping that is what is causing the P1250 code.

So, my question is what do I do about this P1250 code, and if you were having this code what would you do to fix it? Where is the pressure regulator solenoid? I'm assuming the soleniod/related wiring is burning right now..

anyways, thanks!!

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Old 09-06-2007, 12:52 AM
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You should have the colored vacuum diagram, it is the PRC solenoid on that. The first Tee under the i/c pipe connects to it, dont know where exactly it is. A vacuum problem..
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Old 09-06-2007, 06:47 PM
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Under the plastic cover on the passenger side of the engine. It could be the solenoid, or the vacuum hose that leads to the fpr. The fpr is on the rear injector rail on the drivers side.
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Old 09-06-2007, 07:53 PM
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Well I went and started looking at it...but the s/c apparently decided to say **** you and blew up on me as I was idling the engine in my driveway..started smoking white really bad and it's not sweet smelling either. She's smoked finally..I should have never taken it on that trip, and I should have listened to you guys and sold it. ****..where is the cheapest place in Canada to find a s/c?? Looking on some sites I might be smarter to replace the whole fuckin engine as well as I can get a better deal on a complete motor.

Really don't need this bullshit right now..****
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Old 07-04-2011, 09:18 PM
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I am having P1250 as well along with P0421 and P1526 at times. Since P1250 is circuit malfunction it should be that solenoid right? Anybody knows the resistance and the part number?
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Last edited by Saint_; 07-05-2011 at 01:36 AM.
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Old 07-04-2011, 11:17 PM
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I've had the P0421 code for years. I've had the cats replaced numerous times (back under warranty) and that code ALWAYS comes back after a few hundred miles. I'm convinced its a shotty o2 sensor somewhere. Everyone tries to convince me to buy another cat (for a grand.. yeah right) and that will "fix my problem."

I tell them I get close to 27mpg highway with my car ('01 Millenia with 164k miles), and I don't think it'd be possible to do that in car with a torched Cat. Typically it ends the argument.

Good luck with the rest of your codes and that s/c! I steer clear of s/c just for that reason.
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Old 07-05-2011, 07:41 PM
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Not sure about the resistance but the part number for the PRC solenoid for the 2.3L is KJ01-13-280. Looks like the MX-5 might use the same part #.
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Old 07-05-2011, 07:49 PM
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The resistance spec is 22-26ohm. Is that the solenoid part # or the regulator itself?
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Old 07-06-2011, 03:37 PM
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Looks like PRC solenoid is as useless as CAC solenoid. Is it safe to omit it?

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Old 07-06-2011, 11:23 PM
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It would probably run fine without it but the engine would probably need more cranking than usual when restarting it hot. Part number is for the solenoid.
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