P04F1
4 owner reports and 22 manufacturer filings across 8 model years from Acura, Honda.
Where P04F1 shows up
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2018 Honda CR-V | Engine And Engine Cooling | 4 | 1 |
| 2021 Honda CR-V | Electrical System | 4 | — |
| 2020 Honda CR-V | Electrical System | 4 | — |
| 2019 Honda CR-V | Engine And Engine Cooling | 4 | — |
| 2017 Honda CR-V | Engine And Engine Cooling | 4 | — |
| 2022 Honda CR-V | Engine And Engine Cooling | 2 | — |
| 2019 Honda Pilot | Fuel/Propulsion System | — | 2 |
| 2018 Acura MDX | Fuel/Propulsion System | — | 1 |
A model year appears here because the code is named in its record, not because every one of these vehicles sets it. Counts are mentions in the federal files, not failure rates — nobody publishes the denominator.
What it gets filed under
What owners said
Source: NHTSA complaint databaseOwners’ own words, one per nameplate, scrubbed of anything identifying. These are unverified reports filed with NHTSA — they are what was said, not a finding that it was true.
My engine light came on, and the codes reported were P0441 P04F1 U0401 and P0172
MIL is displaying the following DTCs: P0441 P04F1 Acura dealership is stating TSB - 21-081 does not apply to my year, make, model vehicle
Manufacturer filings that name it
Source: NHTSA manufacturer communicationsService bulletins and campaigns whose filed summary names P04F1. Quoting the document number at a service desk is often the fastest route to a diagnosis someone has already written down.
- A21-0812021-11-13 · Engine And Engine Cooling
- Service Bulletin - The MIL comes on with DTCs P0441 (EVAP System Purge Flow Malfunction) P04F1 (EVAP System Low Purge Flow Detected).
- A21-0812021-11-04 · Engine And Engine Cooling
- Service Bulletin - The MIL comes on with DTCs P0441 (EVAP System Purge Flow Malfunction) P04F1 (EVAP System Low Purge Flow Detected).
- A21-0812021-10-26 · Engine And Engine Cooling
- Service Bulletin - The MIL comes on with DTCs P0441 (EVAP System Purge Flow Malfunction) P04F1 (EVAP System Low Purge Flow Detected).
What P04F1 means
Source: SAE J2012 / OBD-IIP04F1 sits in the generic range of the OBD-II standard, so it means the same thing on every vehicle sold in the United States — but WhichTrim does not carry a definition for it and will not invent one. What is on this page is the record: who named it and on what.
A stored code names the test that failed, never the part that caused it. It is the starting point of a diagnosis, not its conclusion — the same code has several possible causes and the cheap one is not always right.
Common questions about P04F1
Source: NHTSA files and the OBD-II standardCan I keep driving with P04F1 stored?
Nobody can answer that from the code alone, and a site that does is guessing. A steady light generally means the fault was logged and the vehicle is in a reduced-risk mode; a flashing light means stop soon, because a misfiring engine can destroy a catalytic converter in minutes. The safe read of this page is the mileage and the components, not permission.
Does a code mean the car is recalled?
No. Recalls are filed by campaign and matched by VIN, and none of them are triggered by a scan tool. If you want to know whether an open recall applies to one specific vehicle, check the VIN at nhtsa.gov/recalls — that is the only source that settles it.
Why do the counts here differ from other sites?
Because these are not estimates. Every number on this page is a count of documents in NHTSA's own files: manufacturer communications that name the code in their filed summary, and owner complaints that name it in the narrative. We do not model, weight or extrapolate them.
Will clearing the code fix it?
Clearing turns the light off and erases the freeze-frame data a technician would have used to work out what happened. If the condition is still there the code returns, usually within a few drive cycles, and the diagnosis now starts from less information than before.