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These codes relate to your O2 sensors:
P1124 Oxygen Sensing Adaptation Range 1 (Cylinders 1 - 3) Enrichment Limit
P1126 Oxygen Sensing Adaptation Range 1 (Cylinders 4 - 6) Enrichment Limit
It could mean that the O2 sensors are kaput.
But, it's more likely an issue with the MAF as it's unlikely that both banks of O2 sensors would go at the same time.
Do a search about the MAF. You can try cleaning it which works about 50% of the time. If not, you'll need to replace it. Lots of DIY available on this, just do the search.
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