Here are some common reasons why the check engine light may come on in a 2001 Hyundai Trajet:
* Oxygen sensor failure
* Catalytic converter failure
* Evaporative emissions system leak
* Mass air flow sensor failure
* Throttle position sensor failure
* Fuel injector failure
* Ignition coil failure
* Spark plug failure
These are just a few of the many possible causes for the check engine light to come on in a 2001 Hyundai Trajet. If you see this light illuminated, it is important to have the vehicle inspected by a qualified mechanic as soon as possible to avoid any further damage to the vehicle.