There is a black six pin plug above the accelerator pedal with two small black wire probes tape to it. You turn the key off, insert a probe in pin 6 (ushaped plug, lower right hole when u is up), turn the key on, count the long and short flashes. Look up the code. Mine was a 56 abonormal voltage output from G sensor. Thanks to Rod a Lithia Subaru, Oregon City, Parts. Ed