| Fault Code | Description | Typical Cause / Action | | :--- | :--- | :--- | | | Fuel Pressure Sensor | Pressure out of range. Indicates failing low-pressure fuel pump or clogged fuel filter. | | Code 12 | Manifold Absolute Pressure (MAP) | Vacuum leak or faulty sensor. Engine will run rich or lean. | | Code 13 | Oxygen (O2) Sensor | (Common on later 4-stroke models) Sensor not switching. Indicates lean/rich condition or bad sensor. | | Code 14 | Intake Air Temperature (IAT) | Open or short. Engine may idle rough due to incorrect fuel trimming. | | Code 15 | High Fuel Pressure | Faulty high-pressure pump (Verado) or regulator issue. |
Comprehensive List and Interpretation of Mercury SmartCraft Diagnostic Trouble Codes (DTCs) mercury smartcraft fault codes list
| Code | SPN | FMI | Description | |------|-----|-----|-------------| | 24-1 | 3217 | 0 | Exhaust gas temperature (EGT) sensor – bank 1 | | 24-2 | 3217 | 3 | EGT sensor – short to ground | | 25-1 | 3225 | 0 | Oxygen sensor (HO2S) – lean condition | | 25-2 | 3225 | 1 | Oxygen sensor – rich condition | | 29-1 | 3226 | 7 | Catalyst efficiency below threshold | | Fault Code | Description | Typical Cause
Return to port immediately; check alternator and battery connections. Low Battery Voltage : Voltage dropped below critical levels. Engine will run rich or lean
