Using a Trouble Code Reader Video

How to Check for Trouble Codes

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 within various systems it controls and monitors. Your vehicle has many different sensors that monitor and control the various systems that keep performance, mileage and emissions at an optimum level. 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. To find out what your vehicles computer sees wrong, you will need a simple to use tool called an OBD11 trouble coder reader.

All 1996 and newer vehicles utilize a "D" style plug-in connector that connects to the code reader. On most vehicles the connector is located in the driver's compartment, usually under the dash on the drivers side. Once the code reader is plugged in you can retrieve trouble codes the engine computer has stored in its memory. If your car is older than 1996, an OBD1 scanner is required to read the codes. These OBD1 scanners will vary depending on manufacturer. These diagnostic trouble codes are the same codes the dealer and repair shops use to diagnose and repair your vehicle. A code reader can also be used to clear the trouble codes from the computers memory after repairs have been made. An engine trouble code reader is an easy to use tool and is a worthwhile investment for future repairs.

Trouble Code Retrieval Guide

Malfunction Indicator Lamp
 

The MIL has illuminated during driving this means there is a malfunction trouble code stored in the vehicle's computer.

Locate Your Vehicle's Computer Connector

Locate your vehicle's computer connector (ALDL), most are on the lower driver's side. In some vehicles you might need to look around a little, on the passenger's side, and around the center console under a plastic cover. For more information, check your owner's manual.

Connecting to The Computer to Read Codes