Cadillac 19211435 Sensor Asm,Oxygen

The oxygen sensor exists as a device producing electrical output through the detection of exhaust gas oxygen content and it finds residence inside the exhaust system usually in the manifold or downpipe adjacent to the catalyst. The sensor output voltage varies between zero and one volt which signals a lean mixture when decreased but indicates a rich mixture when increased; correct air-to-fuel ratios result in 0.4 to 0.6 voltmeter reading fluctuations. The initial sensor provides information about engine emissions before they enter the catalyst pathway and the second sensor evaluates these emissions after catalyst processing so the PCM receives overall catalyst performance data. The sensor works at a specific temperature range and it begins OPEN LOOP operation before transit to CLOSED LOOP control when the engine reaches operating temeprature. During CLOSED LOOP mode the PCM adjusts air-fuel ratios according to detected sensor inputs. Quick CLOSED LOOP operation becomes possible when a heated oxygen sensor regulates its operating temperature at its optimal level. Sensor testing requires inspecting its visual state as well as verifying its air supply and examining fuel injectors and fuel pressure levels before investigating vacuum and exhaust leaks together with other potential issues. Engine warming up followed by battery disconnection allows the user to use a special socket for sensor separation while applying anti-seize compound to threads before applying gravitational torque for reinstallation.

An oxygen sensor is a device that produces an electrical voltage when exposed to the oxygen in the exhaust gases.