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O2 sensors regular, replacement needed?? V70-XC70 2004

posted by  Steven H on  Sun Dec 18 14:25 CST 2011
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last visit: Sun Sep 21 18:32 CST 2014
[RELATED]

This does make sense. The mileage has gone down right at 2 mpg. I do keep an eye and figured it was others driving habits until I drove the car solid for a week. I thought the lower mpg might be do to the age of the car even though there is no evidence the engine has grown tired. Should I replace the rear sensor as well or leave it in place?
--
Steven 04 C70 HPT, 04 V70 2.5T Titanium, 06 S40 2.4i






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