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What does Oxygen Sensor Post-Catalytic converter and Pre- Catalytic converter mean?
Wiki User
∙ 11y ago
Oxygen sensors operate by monitoring the concentration of HC's in the exhaust stream. They are heated by the so-called "waste fuel" burning in the exhaust which alters the resistance in the circuit.
As the sensor heats, it provides more resistance, indicating burning fuel. The ECU references this voltage in a table and then compares that to what it's supposed to be and then adjusts the fuel delivery accordingly.
As to the Post-Catalytic converter O2 sensor, there is a different use to which it's put. If the catalytic converter temperature drops (say because your engine is made more efficient) the ECU then references that signal and will increase fuel delivery until it is brought up to temperature.
While I believe it's negative engineering to force over-fueling of the engine, a certain amount of fuel must be consumed in the catalytic converter to maximize its burn potential as the catalyst that converts the emissions components only operate after they have reached a certain temperature.
The Post-Cat O2 is there to ensure it is up to that temperature so it can do its job as well as monitoring how well it's working.
Wiki User
∙ 11y ago
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What is the purpose of the oxygen sensor after the catalytic converter?
The second oxygen sensor is now used downstream of the catalytic converter to monitor converter operating efficiency.
Where is the oxygen sensor on the catalytic converter on a 1999 civic ex?
The oxygen sensor on a 1999 Honda Civic is located on top of the catalytic converter. The catalytic converter is under the car.
Where is the down stream oxygen sensor?
Usually after your catalytic converter. Usually after your catalytic converter.
Where is oxygen sensor located bank 1 sensor 2 on 2001 dodge ram 1500?
That is the oxygen sensor screwed into the downstream side of the catalytic converter.That is the oxygen sensor screwed into the downstream side of the catalytic converter.
Where is the oxygen sensor on a 2003 Mazda Protege?
There is two oxygen sensors. One is located before the catalytic converter is located under the heat sheld. The oxygen sensor after the catalytic converter is found under the catalytic converter (under the car) before the catalytic transfer pipe.
Where is the oxygen sensor on the 1997 Elantra?
The upstream heated oxygen sensor is located ahead of the catalytic converter The downstream heated oxygen sensor is located behind the converter
Where is oxygen sensor 2 on 2001 dodge ram 1500?
Bank 1 sensor 2 is the sensor after the catalytic converterBank 1 sensor 2 is the sensor after the catalytic converter
What is functional difference between upstream and downstream oxygen sensors?
From what I understand , the oxygen sensor ( s ) upstream of the catalytic converter is used in the control of the air / fuel ratio . The oxygen sensor downstream of the catalytic converter is called a catalyst monitor and monitors the efficiency of the catalytic converter
Where is the oxygen sensor on a 1996 Pontiac grand am se 6.0?
The oxygen sensor on a 1996 Pontiac Grand Am is found near the catalytic converter. It will be place on the piping which leads to the catalytic converter.
Where is the bank 1 oxygen sensor for a 2001 dodge neon?
Bank 1 is the oxygen sensor either screwed into ,or above the catalytic converter. Bank 2 is below the catalytic converter.
Where is oxygen sensor on 2000 Hyundai Elantra?
The upstream heated oxygen sensor is located ahead of the catalytic converter The downstream heated oxygen sensor is located behind the converter
Where is the oxygen sensor on 1997 Hyundai Elantra?
The upstream heated oxygen sensor is located ahead of the catalytic converter The downstream heated oxygen sensor is located behind the converter
