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Light gray top: this is the normal color of the oxygen
sensor; White tip: caused by silicon contamination, the
oxygen sensor must be replaced; caused by lead contamination,
if severe, the oxygen sensor must be replaced; The combustion
attachment on this sensor
is caused by lead contamination: the black tip of the sensor
is caused by carbon deposition, and after the engine carbon
deposition is eliminated, the carbon deposition on the oxygen
sensor is generally automatically removed.
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