A defective oxygen sensor may cause a variety of problems for an automobile engine. When a sensor fails, there are a few tricks that a car owner might try to restore sensor performance and to aid in replacement.
Damaged oxygen sensor wiring will cause failure of the sensor. Objects in the roadway may strike the wiring and cause damage. If the wiring comes into contact with hot exhaust components, the wiring's insulation will melt. Before replacing a defective sensor, inspect wiring for damage and repair any found damage.
Oxygen sensors may fail because of the buildup of carbon and other deposits from the exhaust gases. It is possible to remove these deposits and possibly restore proper performance of the oxygen sensor. The use of fuel injector or carburetor cleaner may help to remove deposits of carbon and other combustion sediment.
Oxygen sensors are often difficult to remove. Spraying penetrating oil onto the exposed threads may assist with loosening the sensor. In difficult cases, carefully use a torch to heat the metal of the exhaust surrounding the sensor to aid in removal. When replacing the sensor, antiseize compound should be applied to the threads to make future removal easier.
