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gas mileage is horrible. I am gonna vag my 02 sensor...what are normal levels?

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Old 03-10-2004, 11:39 AM
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gas mileage is horrible. I am gonna vag my 02 sensor...what are normal levels?
Old 03-10-2004, 12:01 PM
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At wot you should see around .75-.85 depending on mods.
Old 03-10-2004, 12:32 PM
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Default For years before 2001 you want to see around .86

anything higher is richer and lower is leaner. On the 2001 it reads more like a wide band, which means the readings get lower you get richer and higher are leaner. But both still want to be around .85-.86 which is right around 12.5:1
Old 03-10-2004, 12:43 PM
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Default Check your fuel trims....

see if it's adding or subtracting any fuel.

Otherwise, during normal driving, it usually bounces between 0.2V to 0.7V

Also check for exhaust leaks, they can throw the sensor off
Old 03-10-2004, 01:05 PM
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Bad EGT sensor can also affect gas mileage.
Old 03-10-2004, 01:47 PM
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Default You mean Oxygen sensors? EGT just reads exhaust gas temp...

It has not effect on gas mileage.

Mau
Old 03-10-2004, 02:56 PM
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Default No, I mean EGT sensor.

I had a bad EGT sensor and it did affect my gas mileage quite a bit. I averaged ~18-19 mpg with the faulty EGT sensor and 21+ mpg once it was replaced.

The EGT sensor DEFINITELY does affect gas mileage.

-Dave Pramanik
Old 03-10-2004, 03:49 PM
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check the engine temp sensor too.
Old 03-10-2004, 03:53 PM
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Default he means coolant temp sensor... it can influence how rich your car runs...

the engine uses it to control "cold start" fuel trims...
Old 03-10-2004, 05:02 PM
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Default I don't think A4s have one...

at least the older ones don't


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