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Hi,
yes, if you have a faulty gasket on the manifold, the o2 sensors detect too much o2 and this will generate a DTC. Also P1126 That is usually a lean condition on Bank 1. Means too much o2. So i would recommend to check all gaskets on bank 1 between engine and the o2 sensors. If there is an exhaust leak on the manifold to cat, this will be the problem.
Regards, Markus
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