1994 850 2.4 Jetronic-Service Engine Light On

[deaster2]

We just returned from a 1600 mile trip in this car, all went well with vehicle. Yesterday morning, on the way to work, my wife didn't get a mile down the road and the service engine light came on. I printed the code list from this site along with the code gathering instructions and on the A2 terminal, all I get is "111". According to the instructions, there is nothing wrong...yet the check engine light is on and won't go off. I disconnected the battery for several minutes, hoping that would "clear" the light, but it didn't. The car has 158,000 miles, while I was out of town last year, the service engine light came on, the wife took it to the Volvo dealer. $800.00 later, timing belt, EGR sensor and some other maintenance items, she was running fine again. The car had 139,000 miles when this occurred. Any thoughts, suggestions, tips or tricks would be appreciated on how to turn the service engine light off. I tried the "reset", but for some reason, I can't get the led to light after holding the button down for five seconds.