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Jana
Anonymous Poster
djphatbear@hotmail.com
Jun 18, 2008, 3:20 PM
Post #1 of 4
(2149 views)
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CO levels and Honda CRV
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Yelp!!!
I recently took my car in to have a smog test completed and it looks like my CO levels are a bit higher than what was listed for a 2002 Honda CRV. What could possibly be the cause of it?
Another thing, but how important is it to change out your oxygen sensors? I found out that I have one bad sensor, but I am not sure what will happen if it is not replaced immediately. What is a general cost for gettingthat fixed? I was quoted between 500-600 dollars.
Thank you for your help!!!
Jana Bean
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 19, 2008, 1:52 AM
Post #2 of 4
(2143 views)
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Re: CO levels and Honda CRV
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A full code reading should lead to which one is causing the code. Then it needs to be determined if the sensor is the problem or the result of a problem and would just happen again. This could really use some pro help and yes this can get pricey and you do need them working especially since you are getting a high CO reading,
T
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DanD
Veteran
/ Moderator
Jun 19, 2008, 5:41 AM
Post #3 of 4
(2139 views)
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Re: CO levels and Honda CRV
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Co is the by-product of incomplete combustion; meaning that all of the fuel that was supplied to the combustion camber has started to burn but did not burn completely.
High CO usually means excessively rich fuel mixture; too much fuel compared to oxygen. 14.7-1 ratio (14.7parts of oxygen- 1 part fuel) is considered “perfect” air/fuel mixture.
The engine management computer strives to supply the engine with this mixture by using its programming and inputs from all the sensors.
Determining the load on the engine, speed of the vehicle, rate of acceleration and temperature (engine & ambient).
Once the computer receives all this information, it calculates the amount of fuel and timing that is required for the engine to perform at its best; while keeping emission as low as possible.
So now the computer has made its calculations and delivered the fuel mixture to the combustion chamber. The ignition lights a match too it and the fire is burning; producing the power to push the vehicle down the road. Once the engine has finished its power stroke, it releases the burnt air/fuel mixture to the exhaust.
This is where the O2 sensor comes into the picture; he’s the quality control inspector. The O2 sensor reports back to the computer how much oxygen is left over after the burn. High oxygen levels means that there was not enough fuel, low amounts of oxygen means too much fuel.
After the computer receives the O2 sensor readings, it compensates in it calculations by adding or removing fuel to the mix. In other words, the computer is constantly adding and removing fuel; in an attempt to get the O2 sensor readings “perfect” at 14.7-1 ratio.
So if you have a “bad” O2 sensor; telling the computer that there is too much oxygen, in the exhaust system. The computer will begin adding more and more fuel, in an attempt to get the O2 readings back to where they should be.
You know the immediate affect of this with a failed emissions test; long term would be poor performance, high fuel consumption, shorter spark plug life and at the extreme shortened engine life, due to fuel contaminating the engine oil.
Yes the O2 sensors may sound expensive but if they have gone bad it would still be good money spent.
Dan.
Canadian "EH"
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Guest
Anonymous Poster
prittykitty19@hotmail.com
Jun 20, 2008, 4:52 PM
Post #4 of 4
(2127 views)
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Re: CO levels and Honda CRV
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I just got my O2 sensor changed in my civic and it was $200 w/ labor. I'm surprised it's so much more for a CRV.
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