The most Useful OBD2 Parameters for regular user

[F. N.]

OBD2 has been designed as the major diagnostic protocol. However there are still information which can be used by regular users even though there are no "Check Engine" warnings.

Here is a list of the most Useful OBD2 Parameters for normal users:
PIDs For Service $01 and &02:
1.  PID 01 : 4 bytes, which reflects: Malfunction Indicator Lamp Status, Number of emission-related DTCs stored, Misfire monitoring, Fuel System monitoring, Comprehensive component monitoring, Catalyst monitoring, heated catalyst monitoring, Evaporative system monitoring, Secondary air system monitoring, A/C system refrigerant monitoring, oxygen sensor monitoring, oxygen sensor heater monitoring, EGR system Monitoring, etc.

2. PID 03: 2 bytes, which reflects Fuel system 1 and 2 status.

3. PID 04: 1 byte, which reflects calculated Load Value!

4. PID 05: 1 byte, which reflects Engine Coolant Temperature.

5. PID 0A: 1 byte, which reflects Fuel Rail Pressure.

6. PID 0B: 1 byte, which reflects Intake Manifold Absolute Pressure.

7. PID 0C: 2 byte, which reflects Engine RPM.

8. PID 0D: 1 byte, which reflects Vehicle Speed (Sensor).

9. PID 0E: 1 byte, which reflects Ignition timing advance for #1 cylinder.

10. PID 0F: 1 byte, which reflects Intake Air temperature.

11. PID 10: 2 bytes, which reflects Air Flow Rate from Mass Air Flow Sensor.

12. PID 11: 1 byte, which reflects Absolute throttle position.

13. PID 1F: 2 bytes, which reflects Time since Engine Start.

14. PID 22: 2 bytes, which reflects Fuel Rail Pressure relative to manifold vacuum.

15. PID 23: 2 bytes, which reflects Fuel Rail pressure.

16. PID 2F: 1 byte, which reflects Fuel level input.

17. PID 31: 2 bytes, which reflects Distance Since diagnostic trouble codes cleared.

18. PID 33: 1 byte, which reflects Barometric pressure.

19. PID 42: 2 bytes, which reflects Control module voltage.

20. PID 45: 1 byte, which reflects relative throttle position.

[F. N.]

PIDs For Service $01 and $02 (continued):
21. PID 46: 1 byte, which reflects Ambient air temperature.

22. PID 4D: 2 bytes, which reflects Minutes run by the engine while MIL activated.

23. PID 4E: 2 bytes, which reflects Time since diagnostic trouble codes cleared.

[F. N.]

The Service $09 is another most used item to get the vehicle information. The most common used infotypes for this service are:

1. InfoType: 01: MessageCount VIN, 1 byte, which reflects the number of messages to report vehicle identifications number.

2. InfoType: 02: Vehicle Identification number, 17 ASCII characters.

3. InfoType: 03: MessageCount CALID, 1 byte, which reflects the number of messages to report calibration identifications.

4. InfoType: 04: Calibration Identifications, 16 ASCII characters.

5. InfoType: 05: MessageCount CVN, 1 byte, which reflects the number of messages to report calibration Verification Numbers.

6. InfoType: 06: Calibration Verification Numbers, 4 bytes.