Im having the same problem with my deville did replacing the cap fix the problem
When the EVAP system triggers a service engine soon light (sometimes called a malfunction indicator lamp or MIL light) and the problem is corrected, the MIL light will turn off after 3 consecutive ignition cycles that the diagnostics run and does not fail.
When the EVAP system triggers a service engine soon light (sometimes called a malfunction indicator lamp or MIL light) and the problem is corrected, the MIL light will turn off after 3 consecutive ignition cycles that the diagnostics run and does not fail.
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The car is telling you that it is DUE for a service SOON.
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