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o2 system

  1. R

    Error code 203 (O2 system)

    Hi everyone, I have a 2015 Yamaha 212ss (California model) and I have the error code 203 (O2 system) on both of my engines. Since my boat is a California model, it has catalytic converters. Does anyone know exactly what this warning is for ("O2 system" is not very specific)? I read in another...
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