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Old 13 Oct 2008, 06:01 pm
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Default need help honda oxygen sensor?

okay i went to get my car diagnos because my check engine light was on.they said it was the oxygen senor that was going wrong.im wondering if that sensor is not the problem what other problem could occur instead the oxygen sensor? (i heard sometime the computer reads that sensor thats wrong but actually it could be the problem that trip the sensor) is so what s the other problem? what does the sensor read or do?any help on fixing it
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Old 13 Oct 2008, 06:16 pm
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If you take it to a Honda dealership, the service department would have the proper computer that "reads" the car's problem(s).It would definitely be able to tell if it is the oxygen sensor or not.
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Old 13 Oct 2008, 06:31 pm
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The oxygen sensor is a device that is used for fuel management. It starts out at .45 volts and switches back and forth above and below this predetermined setting. Above .45, it adds fuel and below it reduces it. When the O2 sensor becomes lazy the computer sees this and turns on the check engine light. A technician can observe this switching with a scanner and determine if this is the problem. Typical life of this sensor is around 120,000 miles give or take a few thousand. The life can be shortened by improper maintenance practices. Lack of tune ups and filter changes.
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Old 13 Oct 2008, 06:46 pm
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the oxygen sensor is a small sensor that screws into you exhaust pipe. Some cars will have more than one. There can be one before the catalytic converter and one after. On older cars with just one before the cat, the sensor is used to keep track of air fuel ratio as well as take diagnostics. Newer cars with two sensors and use them to make sure the catalytic converter is working properly as well as do the other jobs mentioned. If the mechanics say your sensor is bad their probably right..either that or theres something else wrong with your car that you might notice when driving. You should let them replace the sensor which should cost around $50 to $80 not including labor. Its a very quick job and they really shouldn't try to charge much to do it.
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Old 13 Oct 2008, 07:01 pm
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There are three possible conditions with oxygen sensors that are detected by the onboard diagnostic system. I don't know what codes you got during the diagnosis but they will point you in the general direction of what could be wrong.the first codes are for an oxygen sensor heater malfunction. Oxygen sensors are terribly inefficient when cold so they have a heater element in them similar to the element in a kitchen toaster to bring the sensor up to temperature faster. once the oxygen sensor is up to temperature the car can go into closed loop fuel control which gives the computer better control of vehicle emissions. if you get a code for a heater element failure you have to replace the sensor, you can't fix it. the sensing part of the sensor will continue to work fine when warm and you'll probably not notice any driveability issues with a sensor that has a burnt out heater element but the car will have slightly higher vehicle emissions when cold.the second set of codes would be for an oxygen sensor that continually reads lean. that means the sensor doesn't see a change in mixture from rich-to-lean-rich as the computer adjusts the air fuel ratio. if the mixture is continually lean you may have a problem with a vacuum leak that lets unmetered air into the engine (after the throttle body before the intake valve), a bad intake gasket, or a leak in the exhaust between the engine and the sensor.the third general set of codes is for an oxygen sensor that continually reports a rich condition. that can be caused by a leaking fuel injector, a restricted air supply (dirty air filter for example) or high fuel pressure among others.so find out what the code is before you go further with your diagnosis.also, you didn't mention if its the front or rear oxygen sensor. if its the rear it could indicate a bad catalytic converter or an exhaust leak among other problems.hope that helps
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