Grab a copy of

These codes are recommendations not a requirement.

Manufacturers may not follow these, but most do. Check your vehicle’s service manual for DTC meaning if you think the codes you are getting do not make sense.

Remember:
1) Visual inspections are important!
2) Problems with wiring and connectors are common, especially for intermittent
faults.
3) Mechanical problems (vacuum leaks, binding or sticking linkages, etc.) can
make a good sensor look bad to the computer.
4) Incorrect information from a sensor may cause the computer to control the
engine in the wrong way. Faulty engine operation might even make the
computer show a known good sensor as being bad!

http://www.totalcardiagnostics.com/files/Diagnostic-Trouble-Codes-TOAD.zip

Regards,
The Auto Care Forum Team.
www.autocare.com.ng

Thanks.