P04F6

Catalyst Heater Circuit High Bank 1

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine Light Is On
Deterioration of environmental performance on a cold engine
Possible problems with passing technical inspection

Causes

Catalytic converter heater circuit open
Poor contact in circuit connectors
Heating element malfunction
Wiring harness damage
Faulty relay or circuit fuse
Problems with the engine control unit

How to Fix

Check heater circuit fuse and relay
Inspect the wiring harness for damage
Check the resistance of the heating element
Check the contacts in the circuit connectors
If necessary, replace the catalyst heating element
Reset the error and check the system operation

Related codes

P0420 P0430 P04F0 P04F1