Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2021EDGE SE, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEXENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (EXCEPT DIESEL & HYBRID)DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONSP1646 - LINEAR O2 SENSOR CONTROL CHIP (BANK 1)
2021 Ford Edge SE, 4WD
P1646 - Linear O2 Sensor Control Chip (Bank 1)
2021 Ford Edge SE, 4WDSECTION P1646 - Linear O2 Sensor Control Chip (Bank 1)
DTC DESCRIPTION P1646 - LINEAR O2 SENSOR CONTROL CHIP (BANK 1)
| Description: | The PCM monitors the application specific integrated circuit that controls and monitors the universal heated oxygen sensor bank 1, sensor 1 (HO2S11). This DTC sets when the PCM detects an internal circuit or communication concern. | ||
| Possible Causes: |
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| Diagnostic Aids: | Check for other DTCs and diagnose those first. Check for intermittent universal HO2S wiring concerns. Check the universal HO2S wiring between the PCM and the sensor for damage. Check for aftermarket performance products. Reprogram or update the calibration. 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). |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to Pinpoint Test DZ. | ||
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.