When you plug your OBD II scan tool in and get a reading each separate character has its own meaning.
B 1 3 0 0
Assuming that the example above is your OBD II readout you can decipher to a close degree where your trouble is located.
The first letter in this case the “B” indicates a problem in the body of the vehicle. There are four possibilities in the first digit of the readout:
1) “P” for powertrain problems
2) “B” for body related problems
3) “C” for chassis problems
4) “U” is undefined by any of the three, P, B, or C. So you would have to rely on the following digits to hone in on your problem.
The second digit tells you whether the problem is generic “0” shared by all vehicle manufacturers, or a “1” for a manufacturer specific code.
The third digit helps you fine tune your troubleshooting by telling you what sub section of the vehicle the problem may be in:
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US $85.79
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1) “1” is for emissions management either fuel or air
2) “2” is for an injector circuit, either fuel or air.
3) “3” is for ignition misfire.
4) “4” is for emission control.
5) “5” is for Vehicle speed or idle control.
6) “6” is for Computer or output circuit.
7) “7” is for transmission.
“8” is also for transmission
The last two digits identify what specific section of the system is malfunctioning.
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