| Engine Code | Engine Code Description |
|---|
| 37 | Oxygen sensor (no. 2, left side , SVX) |
| 38 | Engine torque control (SVX) |
| 41 | Air/fuel adaptive control |
| 42 | Idle switch or circuit |
| 43 | Throttle switch (Justy) |
| 44 | Wastegate duty solenoid (turbo) |
| 45 | Pressure duty solenoid (turbo)/atmospheric pressure sensor circuit (non-turbo) |
| 49 | Airflow sensor |
| 51 | Neutral switch (manual transmission)/inhibitor switch (automatic transmission) |
| 52 | Parking brake switch (exc. Justy)/Clutch switch (Justy) |
| 55 | EGR temperature sensor |
| 56 | EGR system |
| 61 | Parking brake switch (Loyale)/Fuel tank pressure control solenoid valve (Impreza) |
| 62 | Fuel temperature sensor (Impreza)/Electric load signal (Justy) |
| 63 | Fuel tank pressure sensor (Impreza)/Blower fan switch (Justy) |
| 65 | Vacuum pressure sensor |
