abbe je napisal/-a:zlo nenatančen opis napake.iz tega se sploh vn ne vid kaj bi znal bit narobe
P0251 FUEL PRESSURE REGULATION VALVE-MALFUNCTION.
sepravi ventil ki skrbi za ustrezen tlak v vodu je v okvari.
Čist dost je natančen. Ni vse VAG, pri katerem ti še s prstom pokaže, kaj je narobe in kje točno je okvara.In ni mus, da je IMV prdnu, to napako vrže ven, če je zrak v sistemu ali pa če nekdo ni menjal filtra že zelo dolgo časa

Torej, P0251:
Ne da se mi pisat,zato bom dal copy/paste:
P0251 (Fuel metering valve (IMV) control error)
Symptoms:
• Extremely poor engine performance - glow plug warning lamp flashes.
• Engine cuts out - glow plug warning lamp flashes.
• Engine will not start.
Cause:
• The fuel rail pressure demanded by the system cannot be achieved without the IMV
opening beyond the tolerance specified for that pressure.
• NOTE: The fault descriptions listed below should be worked through in order.
1. Restriction in the low-pressure fuel system, which could be caused by a blockage of a fuel line or
the fuel filter, or a damaged fuel line.
2. Air in the low-pressure system: Check using transparent hoses or remote
feed the fuel injection pump with a filtered proprietary fuel supply to eliminate the vehicle
low-pressure fuel system entirely. Leaking fuel lines or connections can cause air in fuel.
• NOTE: When using transparent hoses a small amount of air in the fuel system is normal due to
a permanent bleed hole in the fuel filter. Recirculation of fuel will occur through the fuel filter
until the temperature of the return fuel is over 40°C (hence any air in the system will
re-circulate until the fuel is above 40°C and is being returned to the fuel tank).
3. Faulty fuel injection pump, transfer pump part, or pressure control valve. Fuel injection pump
internal transfer pressure needs to be at least 6 bar to achieve high pressure chamber filling (to
generate the required fuel rail pressure). Check the following (if the engine does not start):
Remote feed the fuel injection pump with a filtered, proprietary fuel supply. If the engine will
start when the fuel supply is pressurized or held above the fuel injection pump intake (gravity
fed), but will not start when the fuel supply is not pressurized or held below the fuel injection
pump intake then it is likely that there is a fault with the internal transfer pump (i.e. not able to
draw fuel).
4. Faulty fuel injection pump - high-pressure part or inlet metering valve (IMV)
5. Injectors:
Perform a return quantity test using the WDS guided diagnostic. This test uses special tool
310-129. If high return quantities are experienced, check a sample of fuel
from the FIP return for black metallic swarf . Go to the next step.
6. Swarf in the system:
Despite improved materials it is possible there may be swarf in the system, without the fuel
injection pump being defective. A sample of fuel should be collected from the fuel injection pump
return line. If this sample contains over 5mm diameter of black metallic swarf please refer to TSB
42/2003 for appropriate action. First run through all of the other system checks (as described
above).
To je zaenkrat to. A lahko ti s tem code readerjem,s katerim si prebral kodo napake, lahko bereš tudi parametre? Recimo tlak goriva?
Italijani izdelujejo testenine, francozi parfume, nemci pivo, azijci riž, američani pa avtomobile.