P04FF
Catalyst Heater Circuit Performance Bank 2
The catalyst heater on bank 2 is electrically intact but does not deliver the expected thermal effect - measured catalyst light-off time is longer than calibrated. Heater element ageing, increased contact resistance, or a partial winding failure are typical causes.
The catalyst heater on bank 2 is electrically intact but does not deliver the expected thermal effect - measured catalyst light-off time is longer than calibrated. Heater element ageing, increased contact resistance, or a partial winding failure are typical causes.
Common causes
- high
Heater element aged - reduced power output
One of the most commonly reported causes for this code — check this first.
Typical part cost: $440-2750
- medium
Increased contact resistance in supply
A plausible cause — test and verify before replacing parts.
Typical part cost: $440-2750
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does P04FF mean?
P04FF means "Catalyst Heater Circuit Performance Bank 2". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.
What are the most common causes of P04FF?
heater element aged - reduced power output; increased contact resistance in supply — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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