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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
P0035low severityPowertrain

HO2S Heater Control Circuit High (Bank 1 Sensor 2)

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

What this code means

The heater circuit for the downstream oxygen sensor on bank 1 is reading high voltage or an open condition. This slows sensor warm-up and can affect fuel trim readiness.

Symptoms

  • Check engine light on
  • Failed emissions readiness
  • Slightly reduced fuel economy

Common causes

  • Faulty O2 sensor heater element
  • Blown heater fuse
  • Wiring or connector damage
  • Failed PCM driver

Diagnostic steps

  1. Scan and confirm code with freeze frame
  2. Check O2 sensor heater fuse
  3. Measure heater circuit resistance and voltage
  4. Inspect wiring and connectors to sensor
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