P0304 on Audi vehicles Cylinder 4 is misfiring
P0304 is named on 16 Audi model years (2019–2021): 71 manufacturer filings and 0 owner reports in NHTSA’s files, across A6, A7, Q8, Q7, RS and 2 more.
Which Audi model years name P0304
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2021 Audi A6 | Engine | 8 | — |
| 2019 Audi A6 | Engine | 7 | — |
| 2019 Audi A7 | Engine | 7 | — |
| 2021 Audi A7 | Engine | 6 | — |
| 2020 Audi A6 | Engine | 6 | — |
| 2020 Audi Q8 | Engine | 5 | — |
| 2019 Audi Q8 | Engine | 5 | — |
| 2021 Audi Q7 | Engine | 4 | — |
| 2021 Audi Q8 | Engine | 4 | — |
| 2021 Audi RS | Engine | 4 | — |
| 2020 Audi Q7 | Engine | 4 | — |
| 2020 Audi A7 | Engine | 3 | — |
| 2021 Audi S6 | Engine | 2 | — |
| 2021 Audi S7 | Engine | 2 | — |
| 2020 Audi S6 | Engine | 2 | — |
| 2020 Audi S7 | Engine | 2 | — |
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.
Audi filings that name P0304
Source: NHTSA manufacturer communicationsBulletins and campaigns Audi filed with NHTSA whose summary names P0304. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- A0123802069038_4 Service bulletin2023-10-02 · Engine And Engine Cooling
- This bulltin provides information for when the MIL, cylinder misfires, DTCs P0300, P0301, P0302, P0303, P0304, P0305, P0306.
- A0123912069038_5 Service bulletin2023-11-01 · Equipment — Other — Owners/Service/Other Manual
- This bulletin provides information for when the MIL is illuminated, DTCs P0300, P0301, P0302, P0303, P0304, P0305, P0306.
- A0124212069038_5 Service bulletin2024-05-15 · Engine
- This bulletin provides information when the MIL is illuminated, cylinder misfires; P0300, P0301, P0302, P0303, P0304, P0305, P0306
- A0122312069038_1 Service bulletin2022-12-22 · Equipment — Electrical
- software update is available for instances where the MIL is illuminated with one of the following DTCs: P0300, P0301, P0302, P0303, P0304, P0305, P0306.
- A0123352069038_2 Service bulletin2023-01-06 · Electrical System
- This bulletin provides instructions for when the MIL illuminated, and one or more DTCs may be stored; DTC P0300, P3031, P0302, P0303, P0304, P0305, P0306.
- A0123612069038_3 Service bulletin2023-07-17 · Electrical System
- This bulletin provides information for when the MIL is on and DTCs P0300, P0301, P 0302, P0303, P0304, P0305, or P0306 may be stored.
- A0124212069038_5 Service bulletin2024-05-15 · Engine
- This bulletin provides information when the MIL is illuminated, cylinder misfires; P0300, P0301, P0302, P0303, P0304, P0305, P0306
What P0304 means
Source: SAE J2012 / OBD-IICylinder 4 is misfiring.
A stored code names the test that failed, never the part that caused it. The record above is what Audi 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 P0304 a known problem on Audi vehicles?
It is a documented one: NHTSA's files hold 71 manufacturer filings and 0 owner reports naming P0304 on 16 Audi model years (2019–2021). 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 Audi models does P0304 appear on most?
2021 A6 (8 documents), 2019 A6 (7 documents), 2019 A7 (7 documents).
Does P0304 on a Audi 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.