P0579 Mercury Speed Control Switch 1 Performance Condition
Possible causes
– Faulty Cruise Control Function Switch
– Cruise Control Function Switch harness is open or shorted
– Cruise Control Function Switch circuit poor electrical connection
– Cruise Control Function Switch harness is open or shorted
– Cruise Control Function Switch circuit poor electrical connection
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– Cruise control system inoperative
– Cruise control system inoperative
Mercury Vehicle:Mercury Grand Marquis,Mercury Mariner,Mercury Milan,Mercury Mountaineer,Mercury Sable,