P0203 on Mazda vehicles
P0203 is named on 5 Mazda model years (2016–2017): 11 manufacturer filings and 0 owner reports in NHTSA’s files, across CX-5, Mazda3, Mazda6, CX-3.
Which Mazda model years name P0203
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2016 Mazda CX-5 | Engine | 3 | — |
| 2016 Mazda Mazda3 | Engine | 3 | — |
| 2016 Mazda Mazda6 | Engine | 3 | — |
| 2017 Mazda CX-3 | Equipment | 1 | — |
| 2016 Mazda CX-3 | Equipment | 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 P0203
Source: NHTSA manufacturer communicationsBulletins and campaigns Mazda filed with NHTSA whose summary names P0203. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- 01-017-16-3242 Service bulletin2016-08-26 · Engine
- SOME VEHICLES MAY EXPERIENCE AN ENGINE THAT RUNS ROUGH AND THE CHECK ENGINE LIGHT ON WITH DTCS P0201 AND P0204 OR P0202 AND P0203. NOTE:ENGINE MISFIRE RELATED DTCS (P0301, P0302, P0303, P0304) ARE USUALLY STORED AT THE SAME TIME. P0201:00: FUEL INJECTOR CIRCUIT/OPEN CYLINDER NO.1P0202:00: FUEL INJECTOR CIRCUIT/OPEN CYLINDER NO.2P0203:00: FUEL INJECTOR CIRCUIT/OPEN CYLINDER NO.3P0204:00: FUEL INJEC
- 01-004-17-3317a Service bulletin2017-07-05 · Equipment — Other — Owners/Service/Other Manual
- Some vehicles may experience an engine that runs rough and the check engine light on with DTCs P0201 and P0204 or P0202 and P0203. NOTE: Engine misfire related DTCs (P0301, P0302, P0303, P0304) are usually stored at the same time. P0201:00 : Fuel injector circuit/open cylinder No.1 P0202:00 : Fuel injector circuit/open cylinder No.2 P0203:00 : Fuel injector circuit/open cylinder No.3 P0204:00 : Fu
- 01-004-17 Service bulletin2017-02-21 · Engine
- Multi-Model - engine runs rough and check engine light on with DTCS P0201 and P0204 or P0202 and P0203
What P0203 means
Source: SAE J2012 / OBD-IIP0203 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 P0203 a known problem on Mazda vehicles?
It is a documented one: NHTSA's files hold 11 manufacturer filings and 0 owner reports naming P0203 on 5 Mazda model years (2016–2017). 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 P0203 appear on most?
2016 CX-5 (3 documents), 2016 Mazda3 (3 documents), 2016 Mazda6 (3 documents).
Does P0203 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.