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Curly1 · 05-23-2009, 05:58 PM

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

05-23-2009, 05:58 PM	#1 (permalink)
Curly1 EcoModding Lurker Join Date: Oct 2008 Location: United States of Texas Posts: 43 Princess - '08 Chevy HHR LSSR 90 day: 23.66 mpg (US) Thanks: 0 Thanked 2 Times in 1 Post	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