P0190 code

[TurboNate]

So this code popped up after a routine oil change. It's for the fuel rail pressure sensor. Does anyone know where this is located?


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[o1turbo30v]

From Ross-Tech:

16574/P0190 - Fuel Rail Pressure Sensor (G247): Circuit Malfunction
Possible Causes

Wiring and/or connections faulty
Short to ground in of near G247
G247 faulty
Control Module faulty

The G247 sensor i believe is on top of the high pressure fuel pump.

[van462]

Any signs of running rich, has gas smell to exhaust. Often low fuel rail pressure is due to injector stuck open and the pump cannot keep up. There should be a pressure sensor Midway down the fuel rail and the is built into the fuel pump. Using torque app, I normally have 560 psi at idle. If you cut the engine off but leave ignition on it should stay around this level, I haven't tried this last part.

[TurboNate]

Any signs of running rich, has gas smell to exhaust. Often low fuel rail pressure is due to injector stuck open and the pump cannot keep up. There should be a pressure sensor Midway down the fuel rail and the is built into the fuel pump. Using torque app, I normally have 560 psi at idle. If you cut the engine off but leave ignition on it should stay around this level, I haven't tried this last part.

So the fuel rail sensor is built in to the fuel pump? In other words I'll have to replace the whole pump? A buddy of mine actually sent me this picture but my pump does look like that at all. (The white connector harness is the fuel rail sensor)




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[van462]

Looks like I left out some words. The Fuel pressure regulator is on the pump. The rail sensor is on the rail after the pump. This picture above is of the FSI motor in the B7 I believe. The fuel rail leaves the pump in a hard metal line on the bottom of the intake manifold and the sensor I believe is near cylinder 2...maybe. Its been 2 years since I have had my intake manifold off so not really sure. The regulator sends data to the ECM and the ECM controls it by actuating a solenoid that meters fuel into the pump chamber. The ECU uses data from the fuel rail sensor to "see" if it is satisfing the fuel request. A leaky injector causes more fuel flow than the ECU expects. It generates a fault as its out of acceptable limits. A failing regulator solenoid could also cause this. Troubleshooting would involve looking at fuel trims to see if they are negative numbers (reducing fuel as the O2 sensor "sees" a fuel rich mixture) or positive numbers (ECU adding fuel as O2 sensor reads a lean condition)

[TurboNate]

Looks like I left out some words. The Fuel pressure regulator is on the pump. The rail sensor is on the rail after the pump. This picture above is of the FSI motor in the B7 I believe. The fuel rail leaves the pump in a hard metal line on the bottom of the intake manifold and the sensor I believe is near cylinder 2...maybe. Its been 2 years since I have had my intake manifold off so not really sure. The regulator sends data to the ECM and the ECM controls it by actuating a solenoid that meters fuel into the pump chamber. The ECU uses data from the fuel rail sensor to "see" if it is satisfing the fuel request. A leaky injector causes more fuel flow than the ECU expects. It generates a fault as its out of acceptable limits. A failing regulator solenoid could also cause this. Troubleshooting would involve looking at fuel trims to see if they are negative numbers (reducing fuel as the O2 sensor "sees" a fuel rich mixture) or positive numbers (ECU adding fuel as O2 sensor reads a lean condition)

Is this the sensor located between cylinders 1 and 2 under the manifold?




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[van462]

That should be it.