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3 months now and cannot track down the cause of this code. Motor has 168k on it. First code was for poor cat performance and replaced both cats and O2 sensors. Then two weeks later was getting P1175 and P0137. No vacuum leaks can be detected. Injectors have been replaced. Cats been replaced. All O2 sensors have been replaced. PCV valve and piping has been replaced. MAF replaced. Intake gaskets replaced.

Smell of eggs in the exhaust and will eventually burn up an O2 sensor. Once it burns up an O2 sensor the smell is gone and the car runs great but still has P1175 code. Replace the sensor and it immediately smells again.
 
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