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What is an 02 sensor - Cars & Trucks

Posted / edited by AnonymousUser on : 26-10-2020

Answers :

O2 is the chemical designation for oxygen. The engine computer monitors the oxygen content in the exhaust stream to determine if the air-fuel ratio is correct, and uses the information to set the pulse width of the injectors-wider pulse equals more fuel sprayed into cylinders, shorter pulse means less fuel.
The sensor is very reliable (when they are good and not contaminated) in finding the oxygen content. Too much oxygen in the exhaust means the air-fuel ratio is too lean-needs more gas. Too little oxygen means the ratio is too rich, so computer will trim back the injector pulse width.

The system works very well at keeping the theoretically correct "stoichiometric ratio" of 14.7 parts air to 1 part fuel for complete combustion in the cylinders. You will find the computer uses "short term fuel trim" to hover just above and just below the correct ratio of fuel and air-so the oxygen sensor is always switching back and forth between lean and rich signals, constantly. Technicians use this to determine computer and sensor are operating correctly. If lean-rich switching is not occuring at a fast enough rate, it points to a problem . What is called a "lazy o2 sensor" is one that doesn't switch fast enough-one that needs replacing. Oil or carbon deposits can also contaminate the sensors, ruining their effectiveness. And sometimes they just quit working.
Oxygen sensor in the exhaust system.some cars have 1 some have 4 of them 2 before catalitic converter and 2 after it.
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