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 |
|---|---|
| P0371 |
Timing Reference High Resolution Signal A Too Many Pulses |
| P0372 |
Timing Reference High Resolution Signal A Too Few Pulses |
| P0373 |
Timing Reference High Resolution Signal A Intermittent/Erratic Pulses |
| P0374 |
Timing Reference High Resolution Signal A No Pulses |
| P0375 |
Timing Reference High Resolution Signal B Malfunction |
| P0376 |
Timing Reference High Resolution Signal B Too Many Pulses |
| P0377 |
Timing Reference High Resolution Signal B Too Few Pulses |
| P0378 |
Timing Reference High Resolution Signal B Intermittent/Erratic Pulses |
| P0379 |
Timing Reference High Resolution Signal B No Pulses |
| P0380 |
Glow Plug/Heater Circuit "A" Malfunction |
| P0381 |
Glow Plug/Heater Indicator Circuit Malfunction |
| P0382 |
Exhaust Gas Recirculation Flow Malfunction |
| P0383 |
Crankshaft Position Sensor B Circuit Malfunction |
| P0386 |
Crankshaft Position Sensor B Circuit Range/Performance |
| P0385 |
Crankshaft Position Sensor B Circuit Malfunction |
| P0387 |
Crankshaft Position Sensor B Circuit Low Input |
| P0388 |
Crankshaft Position Sensor B Circuit High Input |
| P0389 |
Crankshaft Position Sensor B Circuit Intermittent |
| P0400 |
Exhaust Gas Recirculation Flow Malfunction |
| P0401 |
Exhaust Gas Recirculation Flow Insufficient Detected |
| P0402 |
Exhaust Gas Recirculation Flow Excessive Detected |
| P0403 |
Exhaust Gas Recirculation Circuit Malfunction |
| P0404 |
Exhaust Gas Recirculation Circuit Range/Performance |
| P0405 |
Exhaust Gas Recirculation Sensor A Circuit Low |
| P0406 |
Exhaust Gas Recirculation Sensor A Circuit High |
| P0407 |
Exhaust Gas Recirculation Sensor B Circuit Low |
| P0408 |
Exhaust Gas Recirculation Sensor B Circuit High |
| P0410 |
Secondary Air Injection System Malfunction |
| P0411 |
Secondary Air Injection System Incorrect Flow Detected |
| P0412 |
Secondary Air Injection System Switching Valve A Circuit Malfunction |
