OBD II Fault Code

  • OBD II P206B

    OBD-II Code Wiring issue is defined as a Reductant Quality Sensor Circuit Range/Performance

    The engine computer (PCM) monitors the Reductant Catalyst System's use of DEF and its ability to convert NOx to Nitrogen, Carbon Dioxide, and Water. The PCM uses a Reductant Quality Sensor to monitor the performance of the Reductant system. If the sensor sends back an implausible signal, code P206B is set.

    Wiring issue Symptoms

    • DPF regeneration may not occur

    Common Problems That Trigger the P206B Code

    • DEF contamination
    • Reductant quality sensor failure
    • Selective Catalytic Reduction (SCR) failure
    • Wiring issue

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