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Old 04-02-2014, 09:25 AM   #4
JFP in PA
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Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,273
P1123 is the code thrown when oxygen sensor on bank 1 reaches its limit trying to lean out an overly rich mixture. Normal suspects are high fuel pressure (bad regulator) or a leaking injector.
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