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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
P0434moderate severityPowertrain

Heated Catalyst Temperature Below Threshold (Bank 2)

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

What this code means

The bank 2 heated catalyst is running cooler than required for proper emissions control. The system detects the catalyst is not heating up as commanded.

Symptoms

  • Check engine light on
  • Failed emissions test
  • Increased emissions on startup

Common causes

  • Faulty catalyst heater element
  • Wiring fault in heater circuit
  • Failed heater relay or fuse
  • Degraded catalytic converter

Diagnostic steps

  1. Verify heater power and ground
  2. Inspect heater circuit wiring
  3. Test heater element resistance
  4. Replace heated catalyst or repair circuit
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