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Oxygen Sensors
Also called as the lambda sensor, an oxygen sensor measures the proportion of oxygen in liquid or gas. Scientists use this electronic device in measuring respiration or production of oxygen. Oxygen sensors are also used in automobiles.
3,729 Questions
What causes a check engine light in a new scion tc?
iT COULD HAVE BEEN CAUSED BY "TOPPING OFF" THE GAS TANK. tHE EXTRA FUEL SPILLS OVER IN TO THE CHARCOAL CANISTER WHICH IS A PART OF THE EMMISIONS SYSTEM AND TRIPS THE CHECK ENGINE LIGHT TO COME ON.
What does Oxygen Sensor Post-Catalytic converter and Pre- Catalytic converter mean?
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.
Where is the oxygen sensors on the 2002 Toyota Sequoia?
There are 4 of them. Two on each exhaust pipe. One will be before the catalytic converter and one will be after. Bank 2 is on the passenger side of the car. Bank 1 is on the drivers side. position 1 is in front of the cat position is behind the cat. Each sensor is referred to by bank 1 sensor 2, etc etc. You have to get at them from under the car. The rear ones are easy to remove the front ones can be an absolute nightmare sometimes. Good Luck.
How much should it cost to repair a flex pipe?
Meineke just gave me a quote of $185 for a 1999 Nissan Maxima.
Do all motion sensors have a transmitter and a receiver?
Some devices have the receiver and transmitter built into the same device. Some devices use only a detector and register changes in emitted IR "patterns" (for example) to infer motion.
How do you know when oxygen sensor is not working?
The computer will tell you. If you have a "check engine" light, connect a code scanner to see what the computer has detected. If there is a problem with the oxygen sensor the code scanner will display the appropriate problem code.
How do you change the oxygen sensor?
IMPORTANT: DO NOT DROP THE OXYGEN SENSOR. EXTREMELY FRAGILE!!!! First figure out which one to replace. Buy a sensor for your model car or a univeral one. Should require four wires. Use a slotted socket or a wrench to remove the old sensor. Cut the wires approximately 3 inches from the connector between the connector and the old sensor. Wire in new sensor and install. Further instructions should come with sensor.
How do you replace the knock sensor on a 1995 Nissan maxima?
Standing on the driver side, looking under the center intake manifold; you will see a round black object with a 10mm or 12mm bolt in the center, which is the knock sensor. You will need a small hand and a short 3/8" ratchet or a long ratchet with a offset handle to reach it. After removing the sensor, take off the thin silver clip and disconnect the wire. Do the reverse and you are done. Wear some mechanics gloves to help from cutting your hands up--speaking from experience. Came away with three deep cuts and a lot of my blood remaining on the top of the engine.
How do you replace pathfinder crank sensor?
One 10mm bolt holds the crank sensor to the top tranmission bell housing on the left side. From underneath bend the shield back that hides it and take the bolt out .. you can access the plug to disconnect the wiring easier.
Where is the O2 bank one sensor two located on a 2000 Chevy silverado 5.3 liter v8?
Back 1 Is the drivers side head and exhaust pipe . Follow the drivers side exhaust pipe back towards the muffler and you will see the O2 Sensors screewed into the exhaust pipe. I believe there's 2 per pipe.
Where is the o2 sensor located on a 01 f-150 5.4 v8?
Oxygen Sensor
There are actually (4) O2 sensors on your truck. If you look inside the wheel wells behind the fender liner, right about where the frame is one O2 sensor, the other is underneath the truck about half way back in relation to the transmission. If you see where the exhaust joints together, you went about 6" too far.
When you start looking at the O2 sensors, they are normally numbered something like "Bank 1 Sensor 1" Bank 1 is on the passenger side; Bank 2 is on the driver's side. Sensor 1 is the upstream sensor (near the frame, between the block and the cat) and Sensor 2 is near the Y-pipe (downstream of the cat).
Normally it is the upstream sensors (sensor 1) that go first. They see the harshest conditions.
You will need;
Oxygen Sensor Socket
Anti-Seized
Penetrating Oil
If everything else fells there always heat. Heat them up and they will come right off.
Sometimes it will take 15 minutes or take a few hours it depends on your luck…
How to Match the color on the oxygen sensor with a replacement sensor?
There's no universal color code for oxygen sensor wiring. Buy the right sensor, period.
If you're buying a generic sensor for your car (possible, but there are still many different kinds) and need to splice the wires from the new sensor to the car, usually the black wire is the ground and the other wire is "hot." With three-wire sensors, try to find a wiring diagram online to match up the colors. It's risky using a voltmeter or test light to find the hot wire(s), because you could fry your computer.
Why will catalytic converter turn red when car is running new Transmission was just installed?
When traveling home at night from a weekend camping trip, my wife noticed something glowing under the truck. It turned out to be my catalytic converter. My truck had been running poorly and I barely made it home. It turned out that one of my spark plug wires was bad (burned on the exhaust manifold) and was not firing properly. This caused unburned fuel mixture that was not burned in the cylinder to enter the converter where it would ignite and create the high temperatures, causing the converter to glow bright orange. I would say unburned fuel mixture entering your converter is causing the converter to overheat. A bad spark plug wire is only one of several causes of unburned gas. Others could be failing spark plug, stuck carburetor float, etc. Hope this helps.
Magdude1
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It is possible but highly unlikely as a catalytic converter should NEVER go bad unless something causes it. If you have a check engine light "ON" then I would have someone with the knowledge and equipment to diagnosis it for you. It will save you alot of money. Either a very rich or lean condition will cause a converter to glow red and seem stopped up.jd1709
Where is the coolant and oxygen sensor on a 2000 Monte Carlo SS located and how do you change it?
the coolant sensor is in the radiator on the passanger side
the oxygen sensor is in the exhaust system on the manifold and the pipes and sometimes both
How do you change a 1999 Camry bank1 sensor1?
You need get a special socket for oxygen sensors. Disconnect the harness, use the socket to remove the sensor. Reinstall a new one. Tighten the sensor the proper torque. Put some dielectric grease on the harness, reinstall the harness. Reset the ECU.
Where are the oxygen sensors located on a 1997 Chevy Suburban 1500?
They are about 3 to 4 inches long with an electric wire in the end of them and they are screewed into the exhaust system / pipes. Start up were the pipes bolt to both sides of the engine and work your way back to the muffler and you will find them
Can you remove the catalytic converter if the sensors is before and after the cat?
No. It is not legal. The check engine light will turn on. The computer will try to correct for improper sensor readings and that will cause fuel economy and performance issues.
What does a code PO171 system too lean on my 2003 Chevrolet Malibu mean?
It means that the oxygen sensor is detecting a lean condition. This could be just a vacuum leak.
HOW DO I FIND THIS LEAK AND WERE IS THE MAF SENSOR LOCATED
Where is the oxygen sensor located on a 1988 buick century?
Usually on the "Y" pipe just after the manifold connection points on a duel O2 sensor setup (one on each side) or just before the "y" pipe joins the flex pipe in front of the catalytic converter
Why does the check engine light come on and how do you reset it?
The "check engine light" is a warning light that is illuminated when there is a problem with the EMISSION SYSTEM only. Emission system being the pollution control system. It is a good thing once you understand it.
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The " check engine light" is also known as a malfunction indicator light (MIL). You can disconnect the battery red lead for about 5 min and it will reset. However, if there is a hard fault, it will come back on.
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Disconnecting the battery won't do the trick on OBD 2 vehicles.
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Without a scan tool designed to reset the electronic control module (ecm) a do-it-your-selfer can't reset the check engine light.
Pull the codes from the computer using an OBD (II) code reader. Match the code to the troubleshooting procedure, follow the procedure to find the source of the fault. After you have repaired the fault, the light will go out if that was the only problem. There are "monitors" or self tests the computer runs the car through a drive cycle, if a problem occurs, it may not run all of the self tests until that problem is taken care. Therefore, another problem may exist.
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One point that was brought up a a recent meeting of technicians was that the amount of hydrocarbons is greater when the gas cap is left off than when the engine is running. Hydrocarbons are part of pollution emitted as gasoline evaporates. Going a step farther, one facet of the emission system is the "Evaporative" portion. This is when the fumes from the gasoline are leaking from the system into the outside air. This is one part of the emission system that can trigger a check engine light. I would say that about 7% of the vehicles that have a check engine light are the result of a loose or inadequate gas cap.
But understand that many scenarios are possible with the "check engine light" The vehicle's powertrain computer (note that some vehicles have 17 different computers) will run a series of self-tests. They will only run under certain criteria and they can be vastly different from manufacturer to manufacturer. Some self-tests are not run until preceding ones have run successfully. So if there is a problem in one particular area that is preventing another self test from running, you can have a situation where one problem is fixed, but another still exists. If you fix a problem and drive the car through a drive cycle that sets the monitor (or self test) the light will go off as it passes that criteria that triggered it in the first place.
After 1996, the auto industry went to a idea called OBD II (On Board Diagnostics). This was to get all the manufacturers onto a similar plane for troubleshooting and powertrain control. While they still differ vastly, many corrections and adaptations were made for technicians to better fix the check engine light problems.
Prior to this there were so many different and poor troubleshooting data from a check engine light problem that resolving the problem was much more difficult.
Many early warning lights of this nature were set to illuminate based on mileage. An oxygen sensor was one of the things that was meant to be replaced when that mileage was hit. This is much like many current "Change oil lights" which are set up to come on after a pre-set mileage.
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Great question and good answer above. There is one thing to add however. On my 2004 Buick for example I am required to manually reset the "check oil" light myself every time I get an oil change. This ensures that the system understands the condition the oil is in. If/when I do not reset it, not long after my expected date the light goes on by default as a reminder.
Your instruction manual would outline this. Mine for example is simply...
1. Insert key
2. Turn key to ON, without engaging engine (just before the engine cranks, and leave key there)
3. When placed to ON, press and depress the brake slowly 5 times in 5 seconds.
4. Turn key to off.
5. Turn key and start engine.
The check engine light is now reset, if it returns shortly it is an actual issue, rather then a reminder.
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Some Ford Mondeos have a 'Service interval expired' warning light. It is pretty much the same as the "check oil" light mentioned in the answer above.
On that type of Ford Mondeo there is a small hole in the display screen in front of the 'Service interval expired' warning light. To reset it, just turn the ignition key until the all warning lights come on but do not start the engine. Then press a tiny button in the warning light display panel by poking a straightened metal paper clip through the hole. If you hold it steady for 10 seconds whilst keeping the ignition on, the warning light goes out. It will come on again when the service time period again expires.
Where to Install the Oxygen sensor on a 1986 F-150 XLT?
Most oxygen sensors are located on the exhaust manifold or just after the manifold on the exhaust pipe(s). Your truck probably has two oxygen sensors, one on each side.
Where is oxygen sensor 1 bank 1 located on 2003 Chevy venture?
Bank 1 would be the bank of cylinders that contains the number 1 cylinder. The bank 1 sensor 1 would be the first O2 sensor threaded into the exhaust system after that bank of cylinders that contain the number 1 cylinder.
Where is the upstream O2 sensor on a 1997 Dodge Grand Caravan 3.0L 6 cylinder?
It is threaded into the rear exhaust manifold.
It is threaded into the rear exhaust manifold.
If the check engine light stays on how do you get the fault code on a 2001 Dodge Stratus?
You need a scan tool to read fault codes.
