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    2013 Mercruiser 5.0 MPI O2 sensors

    I have a 2013 Sea Ray 220 SD with a 5.0 MPI. I receive fault codes 48 and 50 on the SmartCraft display sayin Exhaust O2 sensor not functioning properly. Replaced all 4 sensors, but fault code remains. Any ideas on how to get this cleared or find out what the codes actually mean? I have searched...
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