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Front HO2S Heater Circuit Fault (Sensor 1) P0137 63 Secondary HO2S Circuit Low Voltage (Sensor 2) P0138 63 Secondary HO2S Circuit High Voltage (Sensor 2) P0139 63 Secondary HO2S Circuit Slow Response (Sensor 2) P0141 65 Secondary HO2S Heater Circuit Fault (Sensor 2) P0171 45 System Too Lean P0172 45 System Too Rich P0300 — Random Misfire P0301 |