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Bad o2 sensor 27 mpg on a 3 cyl 5 speed?; is this possible ?
Topic Started: Apr 25 2011, 10:23 PM (3,013 Views)
ogoz23
Elite Member
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if dtc means new codes i have driven the car 6 or 7 times after changing the o2 sensor and the engine light has not come on
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Memphis metro


Your not stupid. dtc means diagnostic trouble code.
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ogoz23
Elite Member
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Well I fixed the o2 sensor I checked my mpg again and I'm getting 30 mpg now I have to add this is with the AC on 100% of the time does this sound normal or still way to low on mpg...?
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Woodie
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That's still low, you should be getting about 40 mpg. You don't really know the truth until three full (10 gallon) tanks have been run through.
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ogoz23
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Well I didn't wait till the full 10 gallons I did it at 6 gallons
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ogoz23
Elite Member
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Ok well I got my ultra gauge I notice that I can read the volts on the o2 sensors well where it says bank 1 o2 1 my voltage at idle is around .780 but where it says bank1 o2 2 it's stuck at 1.275 now both o2 sensors are new is this normal?
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Woodie
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The less gallons (and miles) involved in your calculation, the more wildly inaccurate the solution. My point is, until you've got quite a few tanks in, you don't really know with any confidence what your gas mileage is.

Your rear sensor is not switching on for some reason. Once it gets hot enough, that 1.275 starts switching in the .1 to .9 volt range. By the way, your front one should also be switching, not any one voltage you can point to.
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