Service & Repair Manual

24-77
If voltage change does not occur or occurs only
slowly, the following malfunctions could be
present:
Slits or holes in sensor head clogged.
Sensors suffered thermal overload.
Transition resistance in signal wire or Ground
(GND) wire.
Sensor too cold, sensor heating not
functioning.
Sensor damaged by contact spray or similar
substance (contact spray is drawn through the
fine hollow interiors by thermal fluctuations and
capillary action into the electrical wiring in
sensor).
Sensor damaged by silicon vapors (the use of
sealants containing silicon leads to trace
elements of silicon being taken in by the
engine. These silicon elements are not
combusted and damage the oxygen sensor).
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