Question about 2004 Subaru Impreza

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How to fix subaru's p1143 code

Subaru Impreza 2004

I got a p1143 code a month ago, and drove like that until now when I can not fill my gas tank - it takes me about 20 min to fill tank; I replaced the pressure control solenoid valve, but check engine light came on again; I do not now if it is the same code or a different one.
I would appreciate any suggestions on how to try fixing this problem!

Thank you,

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What does the code p1143


Hello there!

P1143 Pressure Sensor Circuit Low Input Possible Causes

* Pressure sensor vacuum line damaged, loose or disconnected * Pressure sensor signal circuit is open or shorted to ground * Pressure sensor reference (5v) circuit is open or shorted to ground * Pressure sensor has failed

Tests/Procedures:

Check for a 5 volt reference on the reference wire Check the voltage on the signal signal wire. 4.0-4.2V KOEO (key on engine off), 2.0-2.3V with manifold vacuum applied. And be sure it has a good ground key on engine off and running.

Source: Subaru master mechanic (Brian)

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