Check engine code P1179 - Defender Source
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  #1  
Old June 30th, 2015, 10:36 AM
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Mikey
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Check engine code P1179

Hi guys,

Any idea what P1179 Maximum Negative AMFR is referring to? And more importantly how to prevent it reoccurring?

Thx
Mikey
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  #2  
Old July 1st, 2015, 10:37 PM
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Mikey
97 Defender 90
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Join Date: Jun 2015
Location: Gilbert, AZ.
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A search, (yeah I know) revealed that P1179 is usually caused by a clogged fuel filter. What appears to have been the original AC Delco filter was indeed so plugged I could barely blow air through, it's a wonder the engine ran at all. I installed a fresh Fram filter with zero flow resistance and not surprisingly the surge of fuel flow and pressure flipped the code to P1180 Maximum Positive AMFR. I let it settle down, drove a few miles, stopped and restarted, then cleared the code. Presto, no reappearance. Lesson learned, replace that fuel filter regularly.

Cheers
Mikey
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Old July 2nd, 2015, 06:50 AM
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Congrats! When I think about it the filters are cheap and easy to get to probably for a reason and should probably be changed more often.
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