Honda N-BOX JF3/JF4 — low-pressure fuel pump recall
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Scope
- Vehicles: N-BOX and N-BOX Custom, DBA-JF3/JF4 and 6BA-JF3/JF4 rows in recall 5423.
- Engines/components: Low-pressure fuel pump and its resin impeller.
- Production window: Listed subranges span 2017-07-26 to 2020-02-14 for JF3 and to 2020-02-12 for JF4. They are not continuous eligibility ranges; use the complete manufacturer table.
- Markets: Japan. The same notice lists other Honda models; their ranges are not interchangeable with N-BOX ranges.
The issue
The impeller can deform and prevent the pump from operating, potentially stalling the engine. The 2024-06-14 correction requires checking the pump identification mark and replacing the pump when applicable; a vehicle inside a listed range is not automatically a replacement case.
Symptoms an owner can detect
- Difficult starting, failure to accelerate, vibration, or stalling, as described in the Honda notice.
- Record the conditions and existing warning messages; do not keep driving to reproduce a suspected fuel-supply failure.
Severity
Critical. Loss of engine power while driving is a safety concern.
Frequency (honest assessment)
The cited manufacturer information does not establish a failure probability for this vehicle or a mileage-based failure rate. A campaign population is not a count of failed vehicles; do not describe every example as defective.
Fix and cost
- Repair: Have Honda check applicability, the pump identification, and the latest remedy/completion record. Fuel-system access and replacement belong to qualified technicians; this entry supplies no tank-removal or pump-opening procedure.
- Typical cost: Japan: confirm individual eligibility and the current remedy terms with the dealer first. No verified general retail price is supplied. Do not promise that all associated repairs are free; obtain an itemized quote for work outside the remedy.
Buyer checklist
- Distinguish “not subject after identification check,” “replacement completed,” and “not yet verified.”
- Confirm the date and scope of the dealer result; earlier fuel-pump campaigns do not establish the current status.
- Do not quote an old parts-supply announcement as a current appointment or completion promise.
Example prompt for an evidence-based check:
2019 Japan-market N-BOX JF3: the chassis appears in a published range, but the seller says the pump needs no replacement. What identification and completion evidence should I request?
Sources
- Honda: recall 5423, corrected 2024-06-14; page updated 2025-02-05
- MLIT: original notification and correction notice
Sources checked: 2026-10-30. Recheck notices and schedules when using this entry. The buyer checklist is this project’s verification workflow, not a reproduction of a factory inspection procedure.