2011 Crown Victoria P018C and Stalling: Compare the Pressure Change, Not Just One Number
A normal gauge reading at one moment does not clear a pressure-feedback fault. Compare the sensor and an independent gauge as operating conditions change.
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2017 Hyundai Santa Fe: P0087 Is Still Permanent, but Is the Fuel Fault Still Active?
An unerasable permanent code is not the same as a returning active fault. This Santa Fe needed both a fuel-pressure repair and a completed self-check before P0087 disappeared.