VI Features and Benefits
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VI is capable of flagging up common diagnostic fault codes, the information below
gives you the breakdown of a fault code and information on all of the most
common fault codes.
Key VI Features and Benefits:
Fault Code Breakdown
OBD-II codes consist of a number of parts.
For example: P0171
Here is a breakdown of what each digit of the code means:
First Character - System
The first character identifies identifies the system related to the trouble code.
P = Powertrain
B = Body
C = Chassis
U = Undefined
Second Digit - Code Type
The second digit identifies whether the code is a generic code (same on all
OBD-II equipped vehicles), or a manufacturer specific code.
0 = Generic (this is the digit zero -- not the letter "O")
1 = Enhanced (manufacturer specific)
Third Digit - Sub-System
The third digit denotes the type of sub-system that pertains to the code
1 = Emission Management (Fuel or Air)
2 = Injector Circuit (Fuel or Air)
3 = Ignition or Misfire
4 = Emission Control
5 = Vehicle Speed & Idle Control
6 = Computer & Output Circuit
7 = Transmission
8 = Transmission
9 = SAE Reserved
0 = SAE Reserved
Fourth and Fifth Digits These digits, along with the others, are variable, and
relate to a particular problem.
For example,a P0171 code means P0171 - System Too Lean (Bank 1).
Common Fault Codes
Here is a list of the more common fault codes that are non-vehicle specific. If
your fault code is not listed here, or is vehicle specific, we recommend taking
your vehicle to a licensed mechanic for further diagnosis.
Click on the code to get a brief description of the code, symptoms,
common causes, and a possible solutions to rectify the fault.