P04F7

Catalyst Heater Circuit High Bank 2

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Increased fuel consumption
Increased level of harmful emissions
Check Engine light comes on
Decrease in catalyst efficiency

Causes

Broken or damaged heating circuit wiring harness
Malfunction of the catalyst heating element
Problems with the relay or circuit fuse
Short circuit in the circuit
Engine control unit (ECU) malfunction

How to Fix

Check the integrity of the heating circuit wiring harness
Measure the resistance of the catalyst heating element
Check relays and circuit fuses
Scan the engine control module for additional errors
If necessary, replace the heating element or wiring harness

Related codes

P0420 P0430 P04F6