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Common Sensor Faults.
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A: Antifreeze Contamination
Antifreeze in the exhaust will attack and destroy the sensing element. A leaking head gasket commonly causes antifreeze contamination. |
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B: Rich Fuel Mixture
This will cause a heavy black carbon layer to form on the sensor element. Rich fuel mixture is usually caused by a failure in the air/fuel metering system |
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C: High Oil Consumption
This will coat the sensing element with a crusty, brown layer. Worn piston rings and valve guides, or other internal engine problems can cause high oil consumption.
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D: Silicone Poisoning
Residue from silicone lubricants will rapidly destroy the sensors element. Care should be exercised not to get silicone lubricants on the oxygen sensor when it is being installed.
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