Home >> Chrysler >> 2006 >> 300 Base, 42RLE/VLP >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - DTCS P0016 To P0121, Diagnostic Code Index, Pre Diagnostic Troubleshooting Procedure & Intermittent Condition >> Electrical Diagnostics >> Diagnosis And Testing >> P0051-O2 Sensor 2/1 Heater Circuit Low >> Possible Causes