P0451 on Mazda vehicles
P0451 is named on 7 Mazda model years (2016–2026): 8 manufacturer filings and 0 owner reports in NHTSA’s files, across Mazda3, CX-70, CX-90, Mazda6.
Which Mazda model years name P0451
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2016 Mazda Mazda3 | Equipment | 2 | — |
| 2026 Mazda CX-70 | Electrical System | 1 | — |
| 2026 Mazda CX-90 | Fuel/Propulsion System | 1 | — |
| 2025 Mazda CX-70 | Fuel/Propulsion System | 1 | — |
| 2025 Mazda CX-90 | Fuel/Propulsion System | 1 | — |
| 2024 Mazda CX-90 | Fuel/Propulsion System | 1 | — |
| 2016 Mazda Mazda6 | Fuel/Propulsion System | 1 | — |
A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.
Mazda filings that name P0451
Source: NHTSA manufacturer communicationsBulletins and campaigns Mazda filed with NHTSA whose summary names P0451. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- 01-003-17-3297a Service bulletin2017-03-29 · Equipment — Electrical
- When the engine is started for the first time after parking overnight in cold weather (below freezing), some vehicles may exhibit the check engine light on with DTC P0451:00 (Fuel tank pressure sensor: sensor characteristic malfunction) stored in memory. This concern may be caused by an increase in discharge resistance due to water accumulated and frozen in the canister vent hose.
- 10213447 Service bulletin2021-03-16 · Back Over Prevention
- MIL ON WITH DTC PO451 AND/OR PO12A Some customer s may complain about a MIL ON with DTC P0451 (Fuel tank pressure sensorL sensor characteristic malfunction) and/or P013A (HO2S: Slow response (during transition from rich to lean)) Recall 8615J repair procedure may correct this concern
- SA-059-25 Service bulletin2025-12-17 · Electrical System
- Some vehicles may experience the CHECK ENGINE light ON with one of the following DTCs or a combination of these DTCs. P0451 • P2422 • P2451 • P0441 • This may be caused by a concern with the fuel pressure sensor or shutter valve operation.
- 01-003-17 Service bulletin2017-01-20 · Fuel System, Gasoline
- When the engine is started for the first time after parking overnight in cold weather (below freezing), some vehicles may exhibit the check engine light on with DTC P0451 (fuel tank pressure sensor: sensor characteristic malfunction) stored in memory. This concern may be caused by an increase in discharge resistance due to water accumulated and frozen in the canister vent hose.
What P0451 means
Source: SAE J2012 / OBD-IIP0451 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. The record above is what Mazda and its owners have filed about it; the code’s page across every make has the whole file.
Common questions
Source: NHTSA files and the OBD-II standardIs P0451 a known problem on Mazda vehicles?
It is a documented one: NHTSA's files hold 8 manufacturer filings and 0 owner reports naming P0451 on 7 Mazda model years (2016–2026). Whether it is a problem on one particular car is a diagnosis, not a count — but a bulletin that names the code on your model year is the place to start.
Which Mazda models does P0451 appear on most?
2016 Mazda3 (2 documents), 2026 CX-70 (1 document), 2025 CX-70 (1 document).
Does P0451 on a Mazda mean it is recalled?
No. Recalls are filed by campaign and matched by VIN; no recall is triggered by a scan tool. Check the VIN at nhtsa.gov/recalls, or open the model year's page here for the campaigns filed against it.