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P1124 is a fuel pump relay code and if it's faulty, it could cause the engine to starve for gas causing a lean condition (thus the P1126 bank 1, but I would expect P1133, bank 2 to be set also).
It is possible that the P1126 is set because the exhaust system has a leak upstream from the front O2 sensor causing that sensor to detect more O2 and then having the DME compensate for a "perceived" lean condition.
How does the car run? Does it feel like it's starving for fuel?
Regards,
paul...
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