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General E46 Forum
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Old 04-29-2010, 03:11 PM   #1
coxm1
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Join Date: May 2009
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Power Loss at Higher RPM's

Well, a month or so back my SES light came on while driving over a pass on a road trip. After scanning the car, the code that pulled was “P0171 – Bank 1 too lean”. So I replaced both pre-cat 02 sensors and reset the SES light. However, a week later the SES light came back on, with the same code.

Now, even when I reset the SES light, I seem to have lost horsepower at higher RPM’s. You can feel a noticeable decrease in acceleration at 4,500RPM.

My next guess is fuel filter, however if the filter was getting plugged then I would think that it would say both banks are running lean. Same goes for a vacuum leak. Does anybody have any ideas as to what would cause this code and/or check engine code?
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Old 04-29-2010, 03:18 PM   #2
Mike666
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You might want to check your MAF sensor. Just a thought.
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Old 04-29-2010, 03:21 PM   #3
coxm1
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Quote:
Originally Posted by Mike666 View Post
You might want to check your MAF sensor. Just a thought.
I did pull the MAF Sensor out and sprayed it with a specifically designed cleaner but it didn't help.
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Old 04-29-2010, 03:33 PM   #4
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