Volvo: 1989 240gl check engine light, sec release, pig tail

Question
recently started car after sitting for approx. 10 months, check engine light is on but cars runs ok. how can i pull codes and clear check engine light.

Answer
Rick,
Left side there is a blinker box. Install pig tail in A2 push button 1 sec. it will flash back a 3 digit code. Do the same for A6. Key in the on position, engine not running. Clear the codes after reading them hold the button down for 5 sec release button when it lights again hold button another 5 sec. If you disconnect the battery for a few minutes that will clear the light also.