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Old 05-23-2009, 04:58 PM   #1 (permalink)
EcoModding Lurker
Join Date: Oct 2008
Location: United States of Texas
Posts: 43

Princess - '08 Chevy HHR LSSR
90 day: 23.66 mpg (US)
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O2 Sensor problem Need help!

I have an 08 Chevy HHR with the 2.2 Ecotoec engine. I love it and have made a bunch of changes to improve mileage. Now I have run into a problem and hope someone here can help. My mileage has been down some latetly. Did a data log on it and it shows fuel trims on the lean side so the ECU is adding additional fuel and hurting mileage some. The O2 sensors says it is a little lean. The car only has 25,000 miles so I would think the O2 sensor is still good.

Any suggestions on how to correct the problem?
Thanks in advance. Curly

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