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Home >> Ford >> 1990 >> Bronco II RWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Test H - Fuel Control >> Code 86 >> Codes 41 and 42:

Codes 41 and 42:

Intermittent HEGO circuit (SIG or GND circuit).
Contaminated HEGO sensor, lead or silicone fouled.

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