P1646 - Linear O2 Sensor Control Chip (Bank 1) - DTC Chart
WARNING: This page is about a different car, the 2015 Lincoln MKZ, 2015 Ford Fusion, and 2015 Ford C-Max. However, it is still accessible from the selected car via links, so may be relevant.
P1646 - LINEAR O2 SENSOR CONTROL CHIP (BANK 1) - DTC CHART
| Description: This DTC sets when an internal universal HO2S circuit or communication concern is detected in the PCM. |
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Possible Causes:
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| Diagnostic Aids: 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 to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) , Programming the VID Block for a Replacement PCM. |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | Refer to the service information Description, Possible Causes and Diagnostic Aids for the DTC. | ||