C5 A6 ENGINE LIGHT KEEP COMING ON

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01-14-2013, 04:21 PM

#11

jcman

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20 mpg on what engine?

The pre OS adjust the fuel trim and the post OS is to report the cat condition only

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01-15-2013, 10:27 PM

#12

lucio_liu

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Quote:

Originally Posted by Just Me

you do knwo a dead O2 sensor can kill a $1000 cat, right?

it might be a bad O2 sensor, but now the mpg is ideally good.

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