What system is it for? Did a mechanic diagnose it as being bad? There could be several solinoids in your car. They are used in power locks, power hood releses, shifter interlocks (keeps you from shifting from park to drive unless your foot is on the brake) or in your transmission for valve control, not to mention your starter has an intergral solenoid to push the starter gear over to the flywheel when you start your car.
So you might be able to fix yourself. But truthfully I'm not sure what Solenoid in your car would be "Solenoid E"