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P1646 - Linear O2 Sensor Control Chip (Bank 1)

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P1646 - LINEAR O2 SENSOR CONTROL CHIP (BANK 1)

Description:  The powertrain control module (PCM) monitors the application-specific integrated circuit that controls and monitors the heated oxygen sensor (HO2S). The test fails when the PCM detects an internal circuit or communication concern.
Possible Causes: 
  • Damaged PCM
Diagnostic Aids:  Internal PCM concern.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   Reprogram or update the calibration. Check for other DTCs and diagnose those first. Make sure to check for aftermarket performance products before installing a new PCM. Clear the DTCs, repeat the self-test. If the DTC is retrieved again, install a new PCM. Refer toFLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .
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