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: Thinking about replacing O2 sensors - banks 1 and 2 are running lean? jeepjeep 07-02-2009, 10:04 AM I keep getting check engine light coming on in my '07 and showing Banks 1 and 2 are running lean. My rear o2 sensors have been tuned out. I was speaking to a buddy of mine who was saying rather than replacing the o2 sensors that the tune it self might be the cause of this? Any ideas? DynamicTuningSolutions 07-02-2009, 11:35 AM If you have a CAI on the car, check to make sure everything is sealed up tight from the MAF to the throttle body. Also check for loose/cracked vacuum fittings if you have catch can's and the like. That is the most common problem when you have a car tuned and then suddenly it starts throwing codes. flyinglow 07-03-2009, 06:50 AM If you have a CAI on the car, check to make sure everything is sealed up tight from the MAF to the throttle body. Also check for loose/cracked vacuum fittings if you have catch can's and the like. That is the most common problem when you have a car tuned and then suddenly it starts throwing codes. :iagree: :goodpost: | |