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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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Repairs418Labor970Torque2994Fluid18DTC3802Battery2Maintenance0Recalls14
P0423moderate severityPowertrain

Heated Catalyst Efficiency Below Threshold (Bank 1)

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

What this code means

The PCM detected the heated catalytic converter on bank 1 is operating below efficiency thresholds. This reduces the converter's ability to clean exhaust gases.

Symptoms

  • Check engine light on
  • Failed emissions test
  • Sulfur exhaust smell

Common causes

  • Failed heated catalyst
  • Faulty O2 sensor
  • Catalyst heater fault
  • Exhaust leak

Diagnostic steps

  1. Scan and confirm P0423
  2. Review O2 sensor data
  3. Check catalyst heater operation
  4. Inspect exhaust system
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