oxegyn sensor reads 0 on OBDII scanner
venturenot
07-17-2011, 07:01 PM
Sometimes when I am at highway speed (55 to 65mph) when going down a hill, if I take my foot off the gas pedal my scanner shows my upstream o2 sensor at 0 and my LT & ST fuel trim at 0. This does not change until I put my foot on the gas and then the O2 sensor starts switching normally and fuel trims begin to change.
Is my O2 Sensor about to go bad? I just changed my throttle position sensor, could this have something to do with the problem?
Is my O2 Sensor about to go bad? I just changed my throttle position sensor, could this have something to do with the problem?
lesterl
07-17-2011, 09:13 PM
Hows your gas mileage?
Any codes pop up?
LT fuel trims staing pretty low (close to 0)?
The closer to 0 you can stay the better it isnt adding/ subtracting fuel to the mix.
Any codes pop up?
LT fuel trims staing pretty low (close to 0)?
The closer to 0 you can stay the better it isnt adding/ subtracting fuel to the mix.
venturenot
07-17-2011, 09:25 PM
Hows your gas mileage?
Any codes pop up?
LT fuel trims staing pretty low (close to 0)?
The closer to 0 you can stay the better it isnt adding/ subtracting fuel to the mix.
Not bad, and not the best it has been
No
They are at zero along with the O2 sensor under the conditions I have described, otherwise long term fluctuates between - 1 and -6
Yes, but maybe it is staying at 0 because O2 sensor is not giving any feedback.
Any codes pop up?
LT fuel trims staing pretty low (close to 0)?
The closer to 0 you can stay the better it isnt adding/ subtracting fuel to the mix.
Not bad, and not the best it has been
No
They are at zero along with the O2 sensor under the conditions I have described, otherwise long term fluctuates between - 1 and -6
Yes, but maybe it is staying at 0 because O2 sensor is not giving any feedback.
lesterl
07-17-2011, 10:05 PM
Well if it is going negative it is subtracting fuel from the mix (leaning it out), perhaps you have a minor fuel leak or something? What is your fuel pressures like?
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