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I agree with the above post. I am not saying it is not lean, but verify the sensor and equipment are accurate. Anyone that tailpipe mounts a sensor (perhaps there are some exceptions) you can pretty much toss out those readings. They slap it on every car regardless of what type of fuel they are running and mistreat the sensor. I do not put much faith in those types of shops...
If they pull the sensor out of a case and can show you how they calibrate or test the sensor for accuracy, then I would trust the readings; provided you are certain there are no exhaust leaks....
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