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Tool Talk Discussion Forum

O2 sensor and ethanol?

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brian 1

05-22-2006 14:22:45




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Have an old (99) Nissan Maxima that is giving check engine light with a code for bad O2 sensor. Just got the car so I don't know the history of it. I was told that either the sensor is bad or could have been from using a tank of 10% ethanol. Anyone have experience or problem like this one?




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Grub0927

05-22-2006 22:11:38




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 Re: O2 sensor and ethanol? in reply to brian 1, 05-22-2006 14:22:45  
I just had to replace the O2 sensor in my 97 Ford Aerostar. In Oregon we use 10% ethanol all winter and it has never been a problem. I changed the sensor, which lasted two days, so I gave up and took it across the street to the shop. Mechanic said there is a rash of bad sensors now because of the imported European fuel and slackened refinery standards after Hurricane Katrina. He got NAPA to warranty the sensor I installed (cracked wire) and everything is fine now. He even heard a vacuum leak I missed because I didn't wear ear protection as a kid.....
Happy Trails- Grub

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bradk

05-22-2006 20:49:38




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 Re: O2 sensor and ethanol? in reply to brian 1, 05-22-2006 14:22:45  
The O2 code could be the effect of a cause other than a "bad" sensor.What you need to have done is to have an experienced technician scan the engine data to determine sensor voltage and component values and check for a mechanical failure such as a ruptured fuel pressure regulator or a vacuum leak.These things will also set an O2 code.The 10% ethanol won't in my opinion cause the code to set.~brad

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Bob

05-22-2006 16:01:18




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 Re: O2 sensor and ethanol? in reply to brian 1, 05-22-2006 14:22:45  
Almost certainly ethanol is better for the sensor than some of the other stuff that has been thrown at it.

If the car has over 50,000 miles, it's time for a new sensor, anyway.



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Bob

05-22-2006 19:51:50




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 Re: O2 sensor and ethanol? in reply to Bob, 05-22-2006 16:01:18  
Another way of looking at this...

More ethanol is needed at a given load than would be required of pure gasoline.

If the 'puter errs, or for other reasons not enough ethanol is injected, a code will be set for "oxygen sensor LEAN". That doesn't mean the sensor has been damaged by the ethanol, it just means the oxygen sensor, for a certain period of time, has been reporting to the 'puter that the mixture is lean.

So, YES, the use of ethanol could have been partly responsible for the code being set, but should not have DAMAGED the oxygen sensor.

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:-)FORDBOY(-:

05-22-2006 20:14:12




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 Re: O2 sensor and ethanol? in reply to Bob, 05-22-2006 19:51:50  
Ethanol wont hurt the sensor to the best of my knowledge. If the code reads sensor low voltage thats when you need to replace it, or it will say sensor 1 bank 1 no voltage same out come needs replacing. Hope this isnt in to technical terms! If you only have two sensors you have an updraft and a downdraft or one before the cat and one after. More than likely its the one before the cat! Hope this helps!! -Tyler

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