Relationship Between Automotive Sensor and OBD Code Reader The article introduces main types of sensor of vehicle. And takes three cases to explain the relations between automotive sensor and OBD code reader. According to the 3 cases, user will be will know more about the significance of OBD-ii code reader for sensors. The most important significance of the obd2 engine code reader is to check trouble of vehicles. So that the driver can avoid possible accident. And send the vehicle to repair in advance and turn off the MIL light. At the end of the article, the author list supported sensor data supported by obd DTC code reader. Though the obd diagnostic code reader is not able to detect all sensors at present, but it will be gradually improved in the future.