P0842 on Mazda vehicles
P0842 is named on 28 Mazda model years (2016–2021): 140 manufacturer filings and 0 owner reports in NHTSA’s files, across CX-5, Mazda3, Mazda6, CX-3, CX-9 and 1 more.
Which Mazda model years name P0842
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2016 Mazda CX-5 | Engine | 15 | — |
| 2016 Mazda Mazda3 | Engine | 15 | — |
| 2016 Mazda Mazda6 | Power Train | 15 | — |
| 2016 Mazda CX-3 | Power Train | 8 | — |
| 2018 Mazda CX-3 | Power Train | 5 | — |
| 2018 Mazda CX-5 | Power Train | 5 | — |
| 2018 Mazda CX-9 | Power Train | 5 | — |
| 2018 Mazda Mazda3 | Power Train | 5 | — |
| 2018 Mazda Mazda6 | Power Train | 5 | — |
| 2017 Mazda CX-3 | Power Train | 5 | — |
| 2017 Mazda CX-5 | Power Train | 5 | — |
| 2017 Mazda CX-9 | Power Train | 5 | — |
| 2017 Mazda Mazda3 | Power Train | 5 | — |
| 2017 Mazda Mazda6 | Power Train | 5 | — |
| 2016 Mazda CX-9 | Power Train | 5 | — |
| 2019 Mazda CX-3 | Power Train | 4 | — |
| 2019 Mazda CX-5 | Power Train | 4 | — |
| 2019 Mazda CX-9 | Power Train | 4 | — |
| 2019 Mazda Mazda6 | Power Train | 4 | — |
| 2021 Mazda CX-5 | Power Train | 2 | — |
| 2021 Mazda CX-9 | Power Train | 2 | — |
| 2021 Mazda Mazda6 | Power Train | 2 | — |
| 2020 Mazda CX-5 | Power Train | 2 | — |
| 2020 Mazda CX-9 | Power Train | 2 | — |
| 2020 Mazda Mazda6 | Power Train | 2 | — |
| 2016 Mazda MX-5 | Engine | 2 | — |
| 2021 Mazda CX-3 | Power Train | 1 | — |
| 2020 Mazda CX-3 | Power Train | 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 P0842
Source: NHTSA manufacturer communicationsBulletins and campaigns Mazda filed with NHTSA whose summary names P0842. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- 05-005-16-3218 Service bulletin2016-07-07 · Engine
- SOME VEHICLES MAY EXPERIENCE THE CHECK ENGINE LIGHT AND AUTOMATIC TRANSAXLE WARNING LIGHT ON WITH ONE OR MORE OF THESE DTCS STORED IN THE TCM MEMORY (P0842, P0847, P0872, P0877, P0780, P1738).P0842:00 - OIL PRESSURE SWITCH NO. 1 (OIL PRESSURE SWITCH B) STUCK ONP0847:00 - OIL PRESSURE SWITCH NO. 2 (OIL PRESSURE SWITCH A) STUCK ONP0872:00 - OIL PRESSURE SWITCH NO. 3 (OIL PRESSURE SWITCH A) STUCK
- 05-005-16-3218 Service bulletin2016-07-07 · Engine
- SOME VEHICLES MAY EXPERIENCE THE CHECK ENGINE LIGHT AND AUTOMATIC TRANSAXLE WARNING LIGHT ON WITH ONE OR MORE OF THESE DTCS STORED IN THE TCM MEMORY (P0842, P0847, P0872, P0877, P0780, P1738).P0842:00 - OIL PRESSURE SWITCH NO. 1 (OIL PRESSURE SWITCH B) STUCK ONP0847:00 - OIL PRESSURE SWITCH NO. 2 (OIL PRESSURE SWITCH A) STUCK ONP0872:00 - OIL PRESSURE SWITCH NO. 3 (OIL PRESSURE SWITCH A) STUCK
- 05-002-15-3019B Service bulletin2015-03-30 · Equipment — Other — Owners/Service/Other Manual
- SOME VEHICLES MAY EXPERIENCE THE CHECK ENGINE LIGHT AND AUTOMATIC TRANSAXLE WARNING LIGHT ON WITH ONE OR MORE OF THESE DTCS STORED IN THE TCM MEMORY (P0842, P0847, P0872, P0877, P0780). P0842:00 - OIL PRESSURE SWITCH NO. 1 (OIL PRESSURE SWITCH B) STUCK ON P0847:00 - OIL PRESSURE SWITCH NO. 2 (OIL PRESSURE SWITCH A) STUCK ON P0872:00 - OIL PRESSURE SWITCH NO. 3 (OIL PRESSURE SWITCH A) STUCK O
- 05-004-18-3466 Service bulletin2018-04-16 · Engine And Engine Cooling
- Some vehicles may experience the check engine light and automatic transaxle warning light ON with one or more of these DTCs stored in the TCM memory (P0842, P0847, P0872, P0877, P0780, P1738). P0842:00 - Oil pressure switch No. 1 (oil pressure switch B) stuck on P0847:00 - Oil pressure switch No. 2 (oil pressure switch A) stuck on P0872:00 - Oil pressure switch No. 3 (oil pressure switch A) stuck
- 05-004-19-3466 Service bulletin2019-05-20 · Power Train
- Some vehicles may experience the check engine light and automatic transaxle warning light ON with one or more of these DTCs stored in the TCM memory (P0842, P0847, P0872, P0877, P0780, P1738). P0842:00 - Oil pressure switch No. 1 (oil pressure switch B) stuck on P0847:00 - Oil pressure switch No. 2 (oil pressure switch A) stuck on P0872:00 - Oil pressure switch No. 3 (oil pressure switch A) stu
- 05-003-20-3725 Service bulletin2020-07-09 · Engine
- Some vehicles may experience the check engine light and automatic transaxle warning light ON with one or more of these DTCs stored in the TCM memory (P0842, P0847, P0872, P0877, P0780, P1738). This is caused by the oil pressure switch A and/or B at the control valve body temporarily or permanently getting stuck due to contamination entering the passage. To correct the problem, some mass production
- 05-001-21-3826 Service bulletin2021-09-03 · Power Train
- Some vehicles may experience the check engine light and automatic transaxle warning light ON with one or more of these DTCs stored in the TCM memory (P0842, P0847, P0872, P0877, P0780, P1738). P0842:00 - Oil pressure switch No. 1 (oil pressure switch B) stuck on, P0847:00 - Oil pressure switch No. 2 (oil pressure switch A) stuck on, P0872:00 - Oil pressure switch No. 3 (oil pressure switch A) stuc
- 05-002-23 Service bulletin2023-05-17 · Power Train
- Some vehicles may experience the check engine light and automatic transaxle warning light ON with one or more of these DTCs stored in the TCM memory (P0842, P0847, P0872, P0877, P0780, P1738).
What P0842 means
Source: SAE J2012 / OBD-IIP0842 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 P0842 a known problem on Mazda vehicles?
It is a documented one: NHTSA's files hold 140 manufacturer filings and 0 owner reports naming P0842 on 28 Mazda model years (2016–2021). 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 P0842 appear on most?
2016 CX-5 (15 documents), 2016 Mazda3 (15 documents), 2016 Mazda6 (15 documents).
Does P0842 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.