DTC P1646: Linear O2 Sensor Control Chip (Bank 1)
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2011 Mercury Milan, 2011 Mercury Mariner, 2011 Mercury Grand Marquis, 2011 Lincoln Town Car, and 2011 Lincoln Navigator L. However, it is still accessible from the selected car via links, so may be relevant.
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: |
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| Diagnostic Aids: | Internal PCM concern. Reprogram or update the calibration. Check for other DTCs and diagnose those first. 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) . | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | Refer to the Description, Possible Causes and Diagnostic Aids for the DTC in table. | ||