P1250 FUEL PRESSURE REGULATOR FAULT

[MartinN]

Hi, my older 2.0ltr Zed is throwing up p1250 code plus FUEL trim fault for both banks, I suspect they are linked.
I have been trying to find out where the regulator is, anyone have a clue?
Also the car was stood for over a year before I picked it up, could a blocked fuel filter contribute to the fault?

The car will misfire at times but clears quickly, it also uses too much fuel so I'm also looking at the intake boots.
Any advice appriciated.

TIA

 

[NZ00Z3]

P1250 is not listed in the codes for the M52TUB20 engine. So, your scanner is guessing. There will be a BMW fault code in the DME and your Scanner manufacturer has tried to map it to something sensible, but its a guess. Do a search for BMW P1250 and you'll see a wide array of attempts to fix it.

Maybe have the car scanned with a scanner with BMW software and get the real code number? Post the code number and description here and we'll have a look.

The fuel pressure regulator on your car is mounted on the front of the fuel rail. The fuel rail pressure is not monitored by the DME.

 

[colb]

What @NZ00Z3 said, fuel trim issues and an decrease in mpg is a sure sign of overfueling usually down to a leaking vaccum system across the engine from the Maf to the exhaust. Unmetered air getting into the system will be picked up by the exhaust sensors and the mismatch from what it has seen pass through ther Maf and the amount the exhaust sensors picks up causes the DME to think its running lean and tells the injectors to increase the volume of fuel being injected to richen the mixture. If you cant find any split or holed hoses and intake boots the nextr move would be to smoke test the engine, that will certainly find any leaks in the system. Holed or splt hoses should be replaced. A decent code reader should be able to view the fuel trims in live data.

 

[MartinN]

Thanks all, I was a bit confused by some replies to similar questions across the BMW forums, hopefully a couple of warmer days spent looking at the car, particularly the hoses on the intake and others will be the answer.

MN