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Old 07-17-2015, 05:26 PM   #1 (permalink)
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Question o2 sensor code but it still works?

I have this strange issue where i get code for my o2 but i still manage to do about 40mpg. is this what causes my mpgs to stay this low? My car is a vw polo from 2000 with 1.4 mpi engine.
error - Album on Imgur
i will be doing a roadtrip soon and i dont want to kill the cat

EDIT: sorry for any mistakes i made. im trying to save as much money as possible and im trying to learn

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Old 07-17-2015, 05:32 PM   #2 (permalink)
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I do not know. About once a week I get an error code for my oxygen sensor, which I replaced with the correct OEM one because I was receiving the code. I just clear it and the car seems to drive fine.
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Old 07-17-2015, 06:20 PM   #3 (permalink)
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Quote:
Originally Posted by Xist View Post
I do not know. About once a week I get an error code for my oxygen sensor, which I replaced with the correct OEM one because I was receiving the code. I just clear it and the car seems to drive fine.
i clear the code and then it says code pending and later it turns into current fault again.
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Old 07-18-2015, 12:48 AM   #4 (permalink)
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The chart linked to would be more helpful if you could increase the range from 0.43 - 0.434v up to 0.0 - 1.0v.
Does it make it into closed loop, at least at times? Fuel trims less than +/- 10%?
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Old 07-18-2015, 05:32 AM   #5 (permalink)
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90 day: 31.34 mpg (US)
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Quote:
Originally Posted by 2000mc View Post
The chart linked to would be more helpful if you could increase the range from 0.43 - 0.434v up to 0.0 - 1.0v.
Does it make it into closed loop, at least at times? Fuel trims less than +/- 10%?
i tried it again and it auto ranges. so it is actually stuck between those 2 values. that means it is broken after all. it drives normal, the fuel economy is not horrible and there is not much black stuff in the exhaust.
The car will make a long (400 mile) trip soon.

EDIT: i will check if it goes into closed loop. i will also disconenct the o2 cable and read it with a volt meter.

EDIT 2: the fuel trim is at 0% it never goes into closed loop and the o2 voltage when hot reads 0,4x volt. I order one from aliexpress cus i am cheap basterd


Last edited by SwiftAnon; 07-18-2015 at 12:44 PM..
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