P1231 MERCURY - High Speed Fuel Pump Relay Activated
- Faulty High Speed Fuel Pump
- High Speed Fuel Pump harness is open or shorted
- High Speed Fuel Pump circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P1231 Mercury DescriptionThe Engine Control Module (ECM) energized the high speed fuel pump and detected no current flow on the circuit.
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