Service bulletins for the 2012 Mazda Mazda3
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
446 on file from NHTSA, as of 2026-10-19.
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Only bulletins with component: Exhaust and emissions are shown. Show all
| MT-002-19 | 2019-10-04. Service bulletin. ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE. If an engine assembly is replaced after a catastrophic internal mechanical failure, clean the intake manifold internally before installing a replacement engine assembly. If the intake manifold is not cleaned properly, the replacement engine may fail prematurely. Metallic debris from the old engine (with catastrophic internal mechanical failure) may rest inside the intake manifold. When the new engine assembly is installed, debris in the intake manifold will be ingested into the new engine and cause internal damage. |
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| 01-016-18-3522 | 2018-10-09. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. On some vehicles, a sulfur smell or 'rotten egg' odor may be noticed coming from the exhaust system. The odor is usually noticed after a cold start, fast idle, extended periods of idling and full throttle acceleration. Sulfur smell is not an indication of an engine concern and will not cause reduced driveability or durability of the engine or any of its emission components. The sulfur smell or 'rotten egg' odor is caused by high amounts of sulfur in the gasoline being used in the vehicle. Sulfur is normally eliminated during the refining process, but the EPA regulation of sulfur in gasoline differs from state to state. Vehicles using fuel containing high amounts of sulfur will most likely emit sulfur smell from the exhaust system. When high sulfur fuel is burned, there is a chemical reaction in the catalytic converter causing the sulfur to oxidize. As the vehicle is driven, the oxidizing reaction odor in the converter will decrease with mileage and age. |
| 01-013-18-3478 | 2018-07-02. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. Some vehicles may exhibit the check engine light on with DTC P0456 stored in the PCM memory. P0456: EVAP system leak detected (very small leak)The concern is most likely the result of the customer not getting the fuel cap completely closed after fuelingthe vehicle. This causes a small fuel vapor leak and turns DTC P0456 on. |
| 01-005-18-3415 | 2018-05-07. Service bulletin. FUEL SYSTEM, GASOLINE; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. Some vehicles may experience a rough idle with the check engine light on and DTC P0015 / P0524 stored in memory. P0015:00 - Exhaust CMP timing over-retarded P0524:00 - Engine oil pressure too low This is caused by a drop in engine oil pressure due to a piece of foreign object stuck on the oil pump pressure relief valve or oil control valve (OCV). The temporary entry of the foreign object triggers a check engine light on, but rough idle will not be produced until a later time. |
| 01-009-14-2909A | 2017-05-08. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. SOME VEHICLES MAY EXPERIENCE A ROUGH IDLE WITH THE MIL ON AND DTC P0015 / P0524 STORED IN MEMORY.•P0015:00 - EXHAUST CMP TIMING OVER-RETARDED•P0524:00 - ENGINE OIL PRESSURE TOO LOWTHIS IS CAUSED BY A DROP IN ENGINE OIL PRESSURE DUE TO A PIECE OF FOREIGN OBJECT STUCK ON THE OIL PUMP PRESSURE RELIEF VALVE OR OCV. THE TEMPORARY ENTRY OF THE FOREIGN OBJECT TRIGGERS A MIL ILLUMINATION, BUT ROUGH IDLE WILL NOT BE PRODUCED UNTIL A LATER TIME. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.