My moms 1992 Honda Accord broke down on her a couple of nights ago while driving, she lost power and had to be towed home. Could this be the main relay switch? It has given her trouble before.

Thanks in advance for the help.

It's possible, but not likely. If the Check Engine Light comes on for 2 seconds and then goes out, when you turn the ignition switch to ON (Position II), then I would replace the Ignition Control Module (ICM) and coil inside the distributor. Be sure to apply silicone heat transfer grease to the back of the new ICM.