My name is XXXXX XXXXX i will be assisting you with this issue of your check engine light .
As you know the malfunction code can only be cleared once the management system sees that all system are working correctly ,
DTC P1646: ECM HO2 Sensor Control Malfunction - Bank 1 Upstream (1/1)
HO2 Sensor 1/1 heater failure
HO2 Sensor 1/1 sensing circuit: short circuit to ground, short circuit to high voltage, open circuit, high resistance
This is normally only a straight forward replacement of the O2 sensor ,but i suggest you have the system first checked with a scan tool , as ECM are known to be the problem in some rare cases..
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