If you see a "check engine" or a "service engine soon" light in your instrument cluster; your car has stored a diagnostic trouble code. This means the computer system on your vehicle has detected a problem with the various systems it controls. Your car has many different sensors that monitor the various vehicle systems.

If the trouble code light has been illuminated your vehicle enters into "limp mode" this means it is running on a predetermined program that causes poor mileage and increased emissions. An engine trouble code reader is an easy to use tool. All 1996 and newer vehicles utilize a "D" style plug-in connector that connects to the auto code scanners.

The following are four notes when using FCAR auto scanner:
1When use FCAR F3-D heavy duty scanners for testing, you must handle with care and be away from heat and electromagnetic field, to avoid interference with the main unit.
2When electrical components energized, you can not disconnect the circuit to prevent the self-inductance, mutual inductance attacking sensors and automotive ECU.
3When electrical equipment works, avoid putting non-magnetic objects close to the vehicle control unit, otherwise the vehicle control unit may be damaged.
4When dismounting vehicle control unit or electrical components, must be carried out 1 minute after turning off the ignition switch.
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