LEMON Manuals
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1990
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Bronco II RWD, Standard, FM132
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Repair and Diagnosis
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Engine Performance
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Testing & Diagnosis
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Engine Controls - Tests W/Codes
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Test H - Fuel Control
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Code 86
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Codes 41 and 42:
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Codes 41 and 42:
Intermittent HEGO circuit (SIG or GND circuit).
Contaminated HEGO sensor, lead or silicone fouled.