Should the engine mangement light come on, you can read most issues through the OBD port using a suitable code reader. More information can be found on the relevant pages for your particular smart: fortwo 450, fortwo 451 and Roadster. Should your code reader simply give you a fault code, please use this system to look up the description, possible cause and resolution where available.
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OBD Codes
| Name | Description |
|---|---|
| P0165 |
O2 Sensor Circuit Slow Response (Bank 2 Sensor 3) |
| P0166 |
O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3) |
| P0167 |
O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 3) |
| P0170 |
Fuel Trim Malfunction (Bank 1) |
| P0171 |
System too Lean (Bank 1) |
| P0172 |
System too Rich (Bank 1) |
| P0173 |
Fuel Trim Malfunction (Bank 2) |
| P0174 |
System too Lean (Bank 2) |
| P0175 |
System too Rich (Bank 2) |
| P0176 |
Fuel Composition Sensor Circuit Malfunction |
| P0177 |
Fuel Composition Sensor Circuit Range/Performance |
| P0178 |
Fuel Composition Sensor Circuit Low Input |
| P0179 |
Fuel Composition Sensor Circuit High Input |
| P0180 |
Fuel Temperature Sensor A Circuit Malfunction |
| P0181 |
Fuel Temperature Sensor A Circuit Range/Performance |
| P0182 |
Fuel Temperature Sensor A Circuit Low Input |
| P0183 |
Fuel Temperature Sensor A Circuit High Input |
| P0184 |
Fuel Temperature Sensor A Circuit Intermittent |
| P0185 |
Fuel Temperature Sensor B Circuit Malfunction |
| P0186 |
Fuel Temperature Sensor B Circuit Range/Performance |
| P0187 |
Fuel Temperature Sensor B Circuit Low Input |
| P0188 |
Fuel Temperature Sensor B Circuit High Input |
| P0189 |
Fuel Temperature Sensor B Circuit Intermittent |
| P0190 |
Fuel Rail Pressure Sensor Circuit Malfunction |
| P0191 |
Fuel Rail Pressure Sensor Circuit Range/Performance |
| P0192 |
Fuel Rail Pressure Sensor Circuit Low Input |
| P0193 |
Fuel Rail Pressure Sensor Circuit High Input |
| P0194 |
Fuel Rail Pressure Sensor Circuit Intermittent |
| P0195 |
Engine Oil Temperature Sensor Malfunction |
| P0196 |
Engine Oil Temperature Sensor Range/Performance |
