It's safety, cleanliness and how quickly it responds need to get better, according to industry watchdog the Quality Care Commission.
Yorkshire Ambulance Service has been told it needs to improve, after the latest inspection by an industry watchdog.
The Care Quality Commission says the trust 'requires improvement', for its safety, responsiveness and effectiveness.
Cleanliness in ambulances raised cause for concern for inspectors - while life saving equipment was also found to be out of date.
It's reported that a defibrillator was not charged for use on one vehicle.
However, the service was praised for its level of care - with patients being treated with compassion, dignity and respect by ambulance staff.