Question about 1997 Mercury Sable

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I just bought a 1997 Mercury Sable it was a private sale. Once I got it home the check engine light was on can't remember the code but it when I looked it up it was the canister purge valve. Spent $80. for the part installed it and now I have po 401 and po443 codes coming up. I don't have any money to put it in a shop for them to fix it. But if you can explain what these codes mean might help me understand these codes better. Thank you!

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  • tlk91767 Mar 13, 2009

    What is:



  • VPWR circuit open to EGR Vacuum Regulator solenoid.



  • Thank you,

    Tamara

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  • 783 Answers

P0401 insufficient EGR flow.

Possible causes:

  • Fault in vacuum supply to EGR vacuum regulator solenoid.
  • EGR valve stuck closed or iced.
  • EGR valve diaphragm leaks.
  • EGR valve or flow path restricted.
  • EGR vacuum hose off, plugged or leaks.
  • VPWR circuit open to EGR Vacuum Regulator solenoid.
  • EVR circuit to PCM open.
  • EVR circuit to PCM shorted to PWR.
  • Differential Pressure Feedback EGR (D.P.F. EGR) sensor pressure hoses both connected improperly.
  • D.P.F. EGR sensor pressure hoses reversed.
  • D.P.F. EGR sensor VREF circuit open.
  • Downstream pressure hose off.
  • Downstream pressure hose plugged.
  • Damaged orifice tube assembly.
  • Damaged EGR Vacuum Regulator solenoid.
  • Damaged D.P.F. EGR sensor.
  • Damaged PCM.



P0443 indicates an intermittent EVAP canister purge valve circuit failure.
Possible causes:
  • Intermittent EVAP canister purge valve or VPWR circuit open.
  • Damaged EVAP canister purge valve.

Posted on Mar 13, 2009

  • Chuck Martin
    Chuck Martin Mar 13, 2009

    Vehicle power circuit.

    It will be battery voltage. All items that actually perform a function(solenoids,valves,injectors,etc.) have 12V power to them and the computer just controls them by supplying a ground. All sensors have a reference voltage,5V supplied to the by the computer and it looks at the return voltage to see how things are responding.

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