P04F3
Catalyst Heater Supply Voltage Bank 2
P04F3 is an OBD-II diagnostic trouble code meaning: Catalyst Heater Supply Voltage Bank 2. Common causes: faulty bank 2 catalyst heater relay, blown heater circuit fuse. Estimated repair cost: $33–167.
Symptoms
- Check Engine Light Is On
- Increased exhaust toxicity during cold start
- Possible simultaneous presence of code P04F2
- Related Bank 2 Catalyst Error Codes
Causes
- Faulty Bank 2 Catalyst Heater Relay
- Blown heater circuit fuse
- Open or short circuit in the power supply circuit of bank 2 heater
- Bank 2 catalyst heating element malfunction
- General power problem with P04F2 code
How to Fix
- Read the error codes and check if P04F2 is present at the same time
- Check bank 2 heater circuit fuse and relay
- Measure the supply voltage at the heater connector of bank 2
- Check the resistance of the heating element of bank 2
- Check the wiring from the relay to the heater
- If both P04F2 and P04F3 codes are present, check the common power circuit
- Replace faulty components
- Reset errors and check the result
Related codes
Error P04F3 by Vehicle Brand
FAQ
What does the P04F3 code mean?
P04F3 is an OBD-II diagnostic trouble code that indicates: Catalyst Heater Supply Voltage Bank 2
What causes a P04F3 error code?
The most common causes of P04F3 include: Faulty Bank 2 Catalyst Heater Relay; Blown heater circuit fuse; Open or short circuit in the power supply circuit of bank 2 heater; Bank 2 catalyst heating element malfunction.
How do I fix a P04F3 diagnostic trouble code?
To fix P04F3: Read the error codes and check if P04F2 is present at the same time. Check bank 2 heater circuit fuse and relay. Measure the supply voltage at the heater connector of bank 2. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P04F3?
Do not drive — repair immediately
How much does it cost to fix P04F3?
The estimated repair cost for P04F3 is $33–167. Actual cost depends on your vehicle, location, and labor rates.
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