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Old 11-08-2015, 11:05 AM
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P0171 Code

I have a 99 2.5l, lately my jeep has been running bad, shuttering, not idling well. About a week ago I got a P0171 code (System too lean Bank 1), so I replaced the upstream O2 because my brother had a spare. After replacing it, the jeep ran great! I was surprised the difference it made. Then about a week later it starts running horribly again and the same code popped up. I do have an exhaust leak. The manifold is cracked. I wouldve replaced it by now but the stud closest to the firewall snapped off inside the head so I've been hesitant on doing it. If anyone could share some insight on this itd be greatly appreciated!

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Old 11-08-2015, 04:44 PM   #2
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most likely that is your issue. the exhaust leak will cause the lean code. i am having same issues on my 97 and i am thinking 02 sensor and or the slight leak i have at manifold. i replaced the 02 but am gonna warranty it out just to rule that out.
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