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  1. C

    Mercury 2002 EFI 150 EST CODES

    Okay I will try this thank you again
  2. C

    Mercury 2002 EFI 150 EST CODES

    I have checked all grounds and they were all very clean would you know where else to look thank you
  3. C

    Mercury 2002 EFI 150 EST CODES

    I have a 2002 mercury EFI 150hp that goes into guardian mode randomly and when I had the codes checked it had codes EST1, EST3 and EST5. Would anyone know the issue. Thanks
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