OBD2 Explained


OBD-II vehicle fault codes are made up of a letter, followed by some numbers. e.g. P0195

Each character in the trouble code is meaningful. The key to these characters is shown in the table below.

and connect it to your carputer. Use the information in the table together with the list of generic fault codes to establish where the fault lies.

FIRST CHARACTER (System)
SECOND CHARACTER
THIRD CHARACTER (Sub-System)
FOURTH AND FIFTH CHARACTERS
Identifies the system to which the fault code applies. Shows whether the code is generic or manufacturer specific. Identifies the sub-system to which the fault code applies. Show the particular fault.
P=Powertrain

B=Body

C=Chassis

U=Undefined
0=Generic

1=Enhanced (manufacturer specific)
1=Emission Management (Fuel or Air)

2=Injector Circuit (Fuel or Air)

3=Ignition or Misfire

4=Emission Control

5=Vehicle Speed and Idle Control

6=Computer and Output Circuit

7=Transmission

8=Transmission

9=SAE Reserved

0=SAE Reserved
P 0 1 95



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