The 551 code is an electrical problem, not vacuum related. The computer tested the solenoid coil and it failed.
Test the solenoid. I already gave you the measurement to be expected.
Steve
98 Contour SE Sport 2.5 Duratec ATX The wifey's car
89 Taurus SHO - 246K miles
94 SHO ATX - 190K
1997 F-150 5.4L ATX - The Workhorse 150K.
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