- 1). Purchase a car code scanner, or visit a local auto parts dealer; large chains will often have a car code scanner they use to check codes for customers. Car code scanners run approximately $50 and up as of 2010 and are available through websites or large auto parts stores. If you have a relatively new vehicle, you don't need to invest in a scanner; simply visit a local shop and ask the clerk to check the error code causing the warning light on the vehicle.
- 2). Consult the vehicle's owner's manual to locate the port where the code scanner plugs in. This port is usually on the driver's side, below steering-wheel level. Plug the scanner into the port, and follow the on-screen prompts, if any. Some scanners automatically detect the error code and provide it. Auto parts store clerks can record the code and look it up in their database or a book of error codes to find out the problem. Costlier scanners will present the error code and the problem, saving the extra step of looking up the code.
- 3). Reset the engine or warning light by pressing the "erase" button on the code reader.
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