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 |
|---|---|
| P0501 |
Vehicle Speed Sensor Range/Performance |
| P0502 |
Vehicle Speed Sensor Low Input |
| P0503 |
Vehicle Speed Sensor Intermittent/Erratic/High |
| P0505 |
Idle Control System Malfunction |
| P0506 |
Idle Control System RPM Lower Than Expected |
| P0507 |
Idle Control System RPM Higher Than Expected |
| P0510 |
Closed Throttle Position Switch Malfunction |
| P0520 |
Engine Oil Pressure Sensor/Switch Circuit Malfunction |
| P0521 |
Engine Oil Pressure Sensor/Switch Circuit Range/Performance |
| P0522 |
Engine Oil Pressure Sensor/Switch Circuit Low Voltage |
| P0523 |
Engine Oil Pressure Sensor/Switch Circuit High Voltage |
| P0530 |
A/C Refrigerant Pressure Sensor Circuit Malfunction |
| P0531 |
A/C Refrigerant Pressure Sensor Circuit Range/Performance |
| P0532 |
A/C Refrigerant Pressure Sensor Circuit Low Input |
| P0533 |
A/C Refrigerant Pressure Sensor Circuit High Input |
| P0534 |
Air Conditioner Refrigerant Charge Loss |
| P0550 |
Power Steering Pressure Sensor Circuit Malfunction |
| P0551 |
Power Steering Pressure Sensor Circuit Range/Performance |
| P0552 |
Power Steering Pressure Sensor Circuit Low Input |
| P0553 |
Power Steering Pressure Sensor Circuit High Input |
| P0554 |
Power Steering Pressure Sensor Circuit Intermittent |
| P0560 |
System Voltage Malfunction |
| P0561 |
System Voltage Unstable |
| P0562 |
System Voltage Low |
| P0563 |
System Voltage High |
| P0565 |
Cruise Control On Signal Malfunction |
| P0566 |
Cruise Control Off Signal Malfunction |
| P0567 |
Cruise Control Resume Signal Malfunction |
| P0568 |
Cruise Control Set Signal Malfunction |
| P0569 |
Cruise Control Coast Signal Malfunction |
