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2015 FORD F-150
3.5L V6 EcoBoost•RWD•AUTOMATIC•gas•turbo
14 active safety recalls on this vehicle — view recalls
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Repairs418Labor995Torque7006Fluid18DTC3796Battery2Maintenance0Recalls14
P0146low severityPowertrain

O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)

on 2015 Ford F-150 3.5L V6 EcoBoost · RWD

What this code means

The third oxygen sensor on bank 1 shows no activity. The signal is flat and not switching as expected.

Symptoms

  • Check engine light on
  • Failed emissions test
  • No downstream O2 activity

Common causes

  • Faulty oxygen sensor
  • Open circuit in wiring
  • Blown fuse or heater fault
  • Corroded connector

Diagnostic steps

  1. Monitor O2 sensor signal for activity
  2. Check sensor heater circuit and fuse
  3. Inspect wiring and connector
  4. Replace sensor if inactive
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