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Old 08-18-2011, 01:27 PM   #3
2nd Gear Member
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Join Date: Jan 2010
Location: Edmonton
Posts: 150
I experienced poor fuel mileage for about a month before my O2 sensor threw a code (1221). After replacing the sensor, mileage was back to normal. 500km per tank isn't terrible if that's all stop and go city driving. 400km is bad.
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