The OBD uses 10 different diagnoses, called modes. Not every mode is supported by ECM engine technology. Younger cars support more OBD modes.
This mode shows the values for a number of sensors:
- Engine speed
- Speed of the vehicle
- Engine Temperature
- Air and fuel mixture, oxygen sensors and other information
Separate sensors are provided with a parameter identifier. The OBD standard (from 2007) includes 137 PID’S, which are not supported by all cars.
This mode immediately displays the data of a malfunction.
The error codes are stored in this mode. Error codes are divided into 4 subcategories:
POxxx: Standard drive errors
COxxx: Error messages related to the chassis
BOxxx: Standard car body defects
UOxxx: Interference with the communication network
In Mode 4, error codes are deleted. You do not need to delete error codes yourself.
Gasoline vehicles carry a self-diagnosis on the oxygen sensors. Mode 5 shows these results. For new models, mode 6 replaces the function of mode 5.
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As replacement of mode 5 mode 6 shows the results of self-diagnosis on systems.
Mode 7 uses the error codes of Mode 3. Here you will find unconfirmed error codes. It is important to check this after reparation.
This mode is hardly used in Europe. Mode 8 shows the results of self-diagnosis on other systems.
In this mode you will find information about the vehicle, including the chassis number and calibration values.
Here you will find the permanent error codes, identical or different from modes 3 and 7. It is not possible to delete these codes through mode 4.