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Join Date: Feb 2012
Location: St. Louis, MO
Posts: 6
Garage
Mafs

2001 Boxster S CEL light came on mechanic found code P1133 and P1126. Replaced MAFS with new Bosch unit and CEL comes back on almost immediately. Help!

Old 09-01-2015, 09:39 AM
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Join Date: Aug 2010
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Both are fuel trim codes, P1126 indicates you have reached the fuel enrichment limit, an indication of an air leak in the intake system for bank 1, 1133 is the fuel trim for bank 2. Neither has anything to do with the MAF.

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Old 09-01-2015, 10:52 AM
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