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Home › Ford › 1990 › Probe LX, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes - 3.0L › Test H - Fuel Control › Code 86 › Code 43:

Code 43:

Low fuel pressure at WOT, fuel pump or restricted supply.
Low fuel flow at WOT, injectors plugged or low battery voltage (less than 11 volts).