- 1). Drive your car down to your local Advance, Jiffy Lube, Pep Boys, O'Reilly's or Napa auto parts store. These chains have OBD-II code scanners and employees trained to use them; some charge a nominal fee for the service, while others perform it for free. Dealerships can clear codes as well, but they always charge for it.
- 2). Turn the ignition to the "on" position but do not start the car. Step out of the vehicle while the technician plugs the code scanner into the OBD-II diagnostic port below the steering wheel. He'll need information regarding your truck's make, model year and engine displacement. After a minute or so, the scanner will read the stored codes and inform you as to the fault; the scanner will prompt the technician to clear the codes afterward.
- 3). Pop the hood, remove the negative battery cable and allow the truck to sit for about five minutes. This alternative approach will clear the computer's codes without the use of a scanner, but it will also erase your clock settings, keyless-door codes and memory-seat settings.
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